Here is my process:
- See if they are selling on Amazon.com or Half.com OR are being bought by Amazon.
- If not, list them on Swaptree.com. I chose Swaptree.com over Paperbackswap.com (PBS) as PBS requires no writing or highlighting in their books. In addition, a benefit of Swaptree.com over Bookmooch.com is that Swaptree.com will help you print out postage.