Best Buy offers the Nokia Lumia 635 No-Contract Windows Phone 8.1 for T-Mobile, AT&T, Boost Mobile, or Virgin Mobile for $49.99 with free shipping. (Amazon charges the same for the AT&T model.) That's tied with our mention from three weeks ago (which required padding) as the lowest total price we've seen. (It's also a current low by $5.) 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. Deal ends March 7.