Walmart has the Nokia Lumia 920 Windows 8 Smartphone, Black (also
Cyan) for
$50 with free shipping. Requires new contract with AT&T or account upgrade. The latest, greatest Windows phone has many advanced features including wireless charging and turn-by-turn directions. Most early reviews cite its heaviness (6.5 ounces). It's currently $100 direct from AT&T.
4.5" 1280x768 IPS LCD, Gorilla Glass, 331 ppi, 32GB storage
4G LTE, dual-band 802.11 a/b/g/n, BT 3.0, 8.7MP camera
Great price, but use caution if you plan to swap this phone to another line on your account. We just picked up a Galaxy S3 last month from wireless.walmart.com (which is actually Simplexity). When we went to activate it we learned that they will charge your credit card $400 if you use a different SIM in it in the first 6 months.
So that you know, Amazon Wireless pulls the same stunt. They will charge your credit card $250 if you cancel your subscription within the first 6 months, on top of the ETF from the carrier.