This Google sheet takes a list of products that you provide and automatically locates them on Amazon. Provide Amazon price data either with Google sheet's own internal command importXML or by uploading ASINS to external software. Then automated formulas will calculate profits based on your indicated fees.

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If you want to use Google Pay or some other form of payment you may also download this tool from GumRoad:

https://mrmarkteach.gumroad.com/l/supplier-to-amazon-matcher