Check it out:
Another option has emerged over the past few months and that is a service called Swappa. Swappa is a marketplace for the buying and selling of Android phones. It is for Android fans by Android fans.
It has garnered positive reviews and the founder, Ben Edwards, is involved in the Android community and is very responsive to questions, comments, suggestions, and critiques. This is often lacking when buying and selling from eBay.
Thank you to Android Academy 101, SmartMobile LLC, and Michael Moore for helping to spread the word about Swappa.