Amazon offers the Sharp Aquos Crystal 4G Prepaid Android Phone for Boost Mobile in Silver, model no. SH306SHBBB, for $99.99 with free shipping. That's tied with our December mention and the lowest total price we've seen. (It's a current low by $50.) It features a 5" edgeless 1280x720 touchscreen LCD, 1.2GHz quad-core processor, 8-megapixel rear-facing camera, Bluetooth 4.0, WiFi, 4G LTE, microSD card slot, up to 13 hours talk time, and Android 4.4 (KitKat).
Note that it's listed as shipping in 2 to 4 weeks.