I would buy and/or sell a used Android device. In fact, I recently purchased 3 used HTC EVO 4G phones.
I first purchased an HTC EVO from craigslist and immediately thereafter, I purchased one for a relative on eBay. These were Sprint HTC EVOs and my plan was to have them both flashed to the Boost Mobile Network. However, on the same day after I purchased one of the phones, I saw an HTC EVO on craigslist that was newly new that had already been flashed to Boost, so I purchased that phone also.
I will sell one of the two unflashed EVOs.