RadioShack offers the Nokia Lumia 635 No-Contract Windows Phone 8.1 for AT&T Wireless GoPhone for $49.99. At the bottom of the page, sign up for RadioShack's email newsletter to get a $10 off coupon, which will cut it to $39.99. With free shipping, that's within a buck of the lowest total price we've seen and a current price low by $9. It features a Qualcomm Snapdragon 400 1.2GHz quad-core processor, 4.5" 854x480 IPS LCD, 512MB RAM, 8GB internal memory, 5-megapixel camera, microSDHC slot, WiFi, Bluetooth, and Microsoft Windows Phone 8.1 OS.