Kailone Tech via Amazon offers the Microsoft Lumia 640 4G LTE No-Contract Windows Phone 8 for AT&T GoPhone in Black for $47.80 with free shipping. That's the lowest total price we could find by $11, although it was $18 less on Black Friday. It features a 5" 1280x720 IPS touchscreen LCD, Qualcomm MSM8926 Snapdragon 400 1.2GHz quad-core processor, 1GB RAM, 8GB internal memory, front and rear cameras, 1080p video capture, Bluetooth 4.0, 802.11n wireless, 4G LTE connectivity, microSDXC card slot, and Windows Phone 8.1 OS with Lumia Denim.