HTC Evo 3D Sprint 4G for $89.99 + $5 shipping. If I hadn't just purchased an iPhone, I'd be getting one.
Make sure you get one with as many included items as possible and the highest grade. I must say though, a grade of 5 on cowboom things looks pretty darn good.
HTC PG86100 EVO 3D Sprint 4G Android Smartphone - Black
This phone features an Android 2.3 operating system, 3G and 4G connectivity capabilities, 4GB of internal memory, built-in Wi-Fi compatibility, and of course a 3D touch screen so you can access the Internet and more from the palm of your hand
Android 2.3 (Gingerbread) operating system
With a Qualcomm Snapdragon dual-core processor (1.2GHz) allows you to stay connected and productive on the go.
4GB internal memory
Allows you to store media. Memory card slot supports microSD cards up to 32GB (card not included).
Camera Resolution: Primary: 5.0MP secondary: 1.3MP