Microsoft Store offers the Unlocked Nokia Lumia 635 Windows Phone 8.1 in Black for $99 with free shipping. That's $80 off list price and the lowest total price we could find. 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.