Right now, Amazon has a deal for the HTC One M8 on AT&T, Sprint and Verizon Wireless. It's going for just $49 on a new contract. However, with AT&T you can get it for free if you sign up for AT&T Next. The HTC One M8 has a 5-inch 1080p display, Qualcomm Snapdragon 801 processor, 2GB of RAM, 32GB of storage and a microSD card slot. There's also a 2600mAh battery inside and it runs on Android 4.4 KitKat and Sense 6.0.
HTC One M8 – Amazon