MobilePros1 via eBay offers the Samsung Replenish Prepaid Android Phone for Boost Mobile
, model no. SPH-M580, for $19.99
with free shipping
. (Joycells via Amazon
has it for the same price with free shipping for Prime members.) That's the lowest total price we could find by $20. It features a 2.8" touchscreen, QWERTY keyboard, 2-megapixel camera, WiFi, micro USB, microSDHC card slot, 2GB memory card, 256MB RAM, 512MB internal memorey, and Android 2.3 OS (Gingerbread).