The real benefit to knowing and calculating your cost of goods sold (a.k.a. COGS) accurately is that it can help you save money on your FBA...
Amazon FBA Cost of Goods Sold Guide
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Amazon Accounting
A2X for Amazon bookkeeping – Automate Your Accounting
With the help of A2X Accounting, FBA sellers and accounting firms no longer have to do the tedious work of manually reconciling everything. >> Learn more.