Everything for Amazon Sellers—in One Base.

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Amazon Arbitrage Explained: Retail vs Online Arbitrage, Compliance Red Lines & Tools Amazon arbitrage is the practice of buying products at a discount from a retailer — in a physical store (retail arbitrage) or from an online store (online arbitrage) — and reselling them on Amazon for a higher price. It is a legitimate, low-capital way to start selling, and Amazon does not ban it. What gets sellers into trouble is not the model itself but how they source, list, and ship. ...

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Amazon COSMO is a machine-learning system Amazon built to mine “common sense” knowledge about shoppers from their behavior, so search can infer the intent behind a query instead of matching keywords alone. It was published by Amazon’s own researchers at the ACM SIGMOD 2024 conference. For sellers, COSMO matters because it pushes ranking further toward “does this product solve the shopper’s underlying need?” — but a lot of what circulates online about it is interpretation, not confirmed fact, so this guide separates the two carefully. ...

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Best Amazon FBA Reimbursement Services 2026: Commission Rates Compared The best Amazon FBA reimbursement service depends on whether you want a done-for-you audit or you’re willing to file claims yourself. For a hands-off service, GETIDA is the market default at a 25% commission with your first $400 recovered free; Eva undercuts the field at a flat 10%; and Refully sits in the middle at 18%. If you’d rather keep 100% of every recovery, a self-service finder like Helium 10’s Refund Genie (free inside its Diamond plan) or a flat-fee audit tool like ReimburseOps ($19/mo) flags the discrepancies and you submit the cases. There is no single best pick—the right one depends on your recovery volume, how much documentation work you’ll do, and your tolerance for commission on money Amazon might have paid you anyway. ...

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Best Amazon Seller Chrome Extensions (2026): A Job-by-Job Comparison There is no single best Amazon seller Chrome extension — the right one depends on the job. For price and demand history, install Keepa; it is free forever and the most-installed of the group. For an all-in-one research overlay on the product page, Helium 10 (Xray) and Jungle Scout lead. For retail and online arbitrage sourcing, SellerAmp SAS is the specialist. And for capturing a listing’s images and video, an asset-downloader like ASINCrate does the one thing the research tools do not. ...

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Best Online Arbitrage Sourcing Tools 2026 No single tool does online arbitrage sourcing end to end — the working setup is a bulk scanner to find deals, an on-page analyzer to check each one, and Keepa underneath both for price history. For most sellers in 2026 that means SellerAmp SAS (from $19.95/mo) as the everyday deal analyzer, Tactical Arbitrage (now only inside Three Colts’ Seller 365 bundle at $69/mo) or Scan Unlimited (free tier, then $720/yr) for bulk list scanning, and a free Keepa account as the data backbone. This guide compares the main online arbitrage software on 2026 pricing, real seller complaints, and where each one fits the sourcing workflow. All prices were checked on 2026-07-21. ...

BSR (Best Sellers Rank) is Amazon’s relative popularity number that shows how a product sells compared to others in the same category — lower is better, #1 is the top seller. It is driven almost entirely by sales volume, weighted toward recent sales, and it updates frequently throughout the day. It is not a quality score, and it cannot be edited directly. This guide explains what BSR is, how Amazon says it is calculated, why the number behaves the way it does, and the honest answer to the question every seller eventually asks: can you actually “optimize” your BSR? ...

Amazon Buy Box: What It Is (Now the Featured Offer) and How to Win It The Amazon Buy Box is the block at the top-right of a product detail page with the Add to Cart and Buy Now buttons. Amazon has renamed it the Featured Offer: when several sellers list the same product, Amazon picks the most competitive offer to feature there, and the customer buys from that seller by default. Winning the Featured Offer matters because the large majority of Amazon sales go through those two buttons rather than the “Other Sellers on Amazon” list beneath them. You win it by being competitive on price, fulfillment speed, stock, and seller performance—not by paying for it. ...

Amazon FBA Fee Increase 2026 & New Selection Program Upgrade The 2026 Amazon FBA fee increase is small in headline terms — fulfillment fees rose an average of $0.08 per unit (less than 0.5% of a typical item’s price) effective January 15, 2026, and Amazon has confirmed there are no new FBA fee types in 2026. The parts that actually move your Q3–Q4 numbers are two dated events still ahead of you: the FBA New Selection Program (2026) upgrade goes live July 30, 2026 with larger fee credits for new products, and the holiday peak fulfillment surcharge returns October 15, 2026 at an average of $0.32 per unit plus a 3.5% fuel and logistics surcharge. This guide lays out each change, who it hits, and the three things worth doing before the end of July. ...

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Amazon Sales Estimator Tools: How Accurate Are They Really? Every Amazon sales estimator — free or paid — works the same way: it reverse-engineers a product’s Best Sellers Rank (BSR) into a monthly-sales guess. None of them sees Amazon’s real sales data, so none is accurate enough to bet a product launch on by itself. The practical answer is to run two or three estimators, treat the numbers as a range rather than a fact, and cross-check the range against first-party signals before you commit money. This guide compares the main free estimators — Jungle Scout, Helium 10, AMZScout, and SellerAmp — on the one dimension that decides whether a launch works: estimate accuracy, with all access limits checked on 2026-07-20. ...

Disclosure: This article contains affiliate links — we may earn a commission at no extra cost to you. This does not affect our rankings or conclusions. Best Amazon Repricer 2026: Aura vs Informed vs Seller Snap vs BQool Compared The best Amazon repricer for most sellers is Amazon’s own Automate Pricing if you want a free, safe starting point, BQool if you want the cheapest paid AI repricer (from $25/mo), and Seller Snap if you run a large catalog and can absorb $100–$500/mo for game-theory AI repricing. There is no single “best” tool—the right pick depends on your monthly revenue, catalog size, and how much billing risk you can tolerate. This guide compares six repricers on 2026 pricing, real user complaints, and the two things that actually decide the outcome: Buy Box win rate and total cost of ownership. ...

FBA vs FBM: How to Choose Between Amazon and Self-Fulfillment FBA vs FBM is the choice between letting Amazon store, pack, and ship your orders (Fulfillment by Amazon) or handling storage and shipping yourself (Fulfillment by Merchant). FBA buys you Prime eligibility and hands off the logistics for a per-unit fee; FBM keeps fulfillment — and its margin, control, and workload — in your own hands. Neither is universally “better.” The right answer depends on the product, your margins, and how much of the operation you want to run yourself — and many sellers use both at once. ...

Amazon Agency: A Buyer’s Red-Line Checklist for Vetting a Full-Service or VAT Partner The best Amazon agency is not the one at the top of a “top 10” list — it is the one whose contract, reporting, and accountability survive the checklist below. Almost every ranked list of “best Amazon agencies” is published by an agency, so the useful question is not which agency is best but which red lines disqualify one before you sign. This guide is a neutral, buyer-side vetting framework built from real, dated seller complaints, plus the questions to ask before money changes hands. ...