I have been buying used books (in good condition) and garage sales and thrift stores and reselling them online at the places mentioned above and at a local bookstore. I have been doing this for about a year, and I have learned what books bring in money and which ones will be rejected.
It really does work if you know what to look for! I have made anywhere from 2 to 10 times what I paid for the book. (Of course, sometimes I get a "lemon" that smells like a rose...but not too often.)
Powells (online) is the one I sell the most books to.
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