eBay offers HTC One M7 32GB Silver AT&T Unlocked in $349.99 with FREE shipping.
Features and specs are 4.7 inches Super LCD3 capacitive touchscreen, 1080 x 1920 display resolution, Corning Gorilla Glass 2, 2 GB RAM, 32GB internal memory, 4MP rear facing camera, 2.1MP front facing camera, Quad-core 1.7 GHz Krait 300 processor, 2300 mAh battery.