Thought some people here might be interested in this book, Retail Arbitrage Profits (Kindle edition). If you don't have a Kindle, you can download a Kindle reader for your computer for free from Amazon. This ebook won't be free forever. No, I am not the author. I haven't read it yet, but it looks like it has some good info, judging from the table of contents. Evidently, this book has been sold for $97. It has a lot of good reviews on Amazon.
"For the first time in print, the complete, authoritative, and exhaustive manual outlining the Retail Arbitrage business model has been compiled and made available to anyone interested in buying products at the retail level to be resold online (used books and media included)."