Free · Four pieces · 54,779 scans
Keepa is not the market. It is one shopper standing in New York.
We scanned 18 cities at the same instant for 117 days, and 43% of the products we tracked carried a different Buy Box price depending on where the customer lives.
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Four files. No signup. Yours.
What you get
Four pieces. Here is what each one cost to make.
No dollar figures in this part. The cost of each piece is measured in days, scans and reconciled units, so you can see what stands behind a page before you spend a minute on it.
Piece one · The research
Geographic Pricing Variance
How often the Buy Box price changes by city, how many sellers hold it at the same moment, and how wide the spread actually runs. Read this one first if you want to know whether any of it is real.
Cost to make117 days, 54,779 scans, 28,664 ASINs, 18 cities inside every scan, roughly 986,000 market prices, and a full 153 pair agreement matrix.
Piece two · The proof
Round Robin Pricing Use Case
One ASIN, six units, every figure checkable. The ladder we walked down, the exact Amazon fees at each step, and the $5.33 the spread was worth against the national Buy Box.
Cost to make6 real units on real orders, 22 eighteen city scans across the window, fees pulled from Amazon’s Product Fees API at each price point, reconciled against the order record.
Piece three · The method
Round Robin Pricing Protocol
Both ladders and the rules for both. Four qualification gates, the reachable ceiling method, the floor and stop rules, three diagnostics, and the $1.96 threshold with the reasoning behind it.
Cost to makeBoth ladders, the router that picks between them, worked examples on each, and every threshold written out in full so you can argue with it.
Piece four · The working file
Pricing Ladder Worksheet
One tab per ladder, formulas already built. Log each price step and what cleared at it, and the last column turns the method into your own evidence instead of ours.
Cost to makePre-loaded with both worked examples, so the $5.33 reproduces the moment you open the file and you can watch the arithmetic move.
The whole stack: 4 pieces, 25 pages, 1 working file, 117 days of scanning, 54,779 scans, 28,664 ASINs, roughly 986,000 market prices, and 2 fully worked examples. Free.
What the scans found
43%
of the ASINs we tracked changed Buy Box price by city at least once
96.8%
of scans had more than one seller holding the Buy Box at the same moment
$1.96
the spread at the 75th percentile, against a median of $0.70
+23%
more profit on six units of one toy car, reconciled against the order record
Scans captured between 9 April and 4 August 2026 across 18 US cities. Every figure is an aggregate count, reproducible from the scan record.
Fit
Who this is for, and who it is not for
This is a recipe, not a rulebook. It is what we do with our own inventory, written down so you can look at it. Your cost basis, your cash position and your minimum profit target are yours to set, and every number in here moves when yours do.
This is built for you if
- You reprice against a single number and have never asked which city that number came from
- You carry replenishable inventory, where a dollar a unit compounds across a year
- You want the arithmetic rather than the claim, because every figure in here is checkable
- You have twenty minutes and one ASIN you are willing to test on Monday morning
- You cannot see regional prices at all and still want a ladder that works without them
It is not for you if
- You want software that prices for you. These ladders are something you run by hand, a few minutes at a time
- You sell a few units a month and price is not what is holding you back. Sourcing comes first
- You want a promise about your catalog. We measured ours, and yours is yours to measure
If the map is out of reach, go straight to paper 3 and read the second ladder. The 4-Week Price Discovery Ladder needs no spread data at all, works on any product, and is a complete protocol on its own.
One thing we sell
The hard part was never the method
The hard part is seeing the spread in the first place, which takes sampling a lot of cities at the same instant, and our own testing found that fewer than ten cities systematically understates it. The Buy Box by Metro map in PATH Profit Zones is where we look at that spread on our own catalog. It is a premium feature at $9.99 a month or $95.90 a year, there is no free version of the map, and the Kit above works whether you have it or not.
Get everything in one click
All four files in a single archive, if you would rather not click four times. Same files, same numbers.
Download the whole Kit (.zip)Your inventory has an address
Four papers, 25 pages, and the worksheet with both worked examples already in it. Nothing is held back for a paid tier.
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