Microsoft Store offers the Unlocked Lumia 550 8GB GSM LTE Windows 10 Smartphone in Black for $99 with free shipping. That's $40 under our January mention and the lowest total price we've seen for this phone with Windows 10. (It's also a current low by $6.) It features a 4.7" HD OLED touchscreen display, 1280x720 resolution, Qualcomm Snapdragon 210 1.1GHz quad-core processor, 5-megapixel camera, 1GB RAM, 8GB internal memory, and Windows 10 Mobile.