For new customers only, MetroPCS offers the LG Optimus L70 No-Contract 4G Android Smartphone for $49. This $49 mail-in rebate drops it to $0. With free shipping, that's $149 off and the lowest total price we could find. It features a 4.5" 480 x 800 Gorilla Glass touchscreen LCD, Cortex-A7 1.2 GHz dual-core processor, 1GB RAM, 4GB internal storage, 5-megapixel rear camera, front-facing camera, 1080p video recording, 802.11n wireless, Bluetooth, microSD card slot, and Android OS 4.4 (Kit Kat).
Note that it must be activated to a new account with a $50 per month or higher rate plan to qualify for the rebate.