Walmart offers the ZTE Whirl 2 Prepaid Android Smartphone for NET10 for $19.84. Opt for free in-store pickup to avoid the $4.97 shipping charge. (Sears offers it for a few cents more.) That's tied with our November mention, $30 off list price, and the lowest price we could find. It features a 3-megapixel camera, GPS, Bluetooth, and Android 4.3 OS (Jelly Bean).