Best Buy offers the Nokia Lumia 635 No-Contract Windows Phone 8.1 for AT&T Wireless GoPhone for $79.99 with free shipping. (Amazon and Fry's Electronics charge the same.) That's tied with our mention from a month ago as the best deal we've seen for this phone new on any prepaid network. (It's the lowest total price we could find today 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.