BuySpry via eBay offers the Unlocked Microsoft Surface 3 10.8" 128GB 4G LTE GSM Windows Tablet for $339.99 with free shipping. That's the lowest price we could find by $110 and the best deal we've seen for any new 128GB Surface 3 model. It features an Intel Atom x7 Z8700 1.6GHz quad-core processor, 10.8" 1920x1280 (1080p) touchscreen LCD, 4GB RAM, 128GB flash storage, 802.11ac wireless, Bluetooth 4.0, 8-megapixel rear-facing camera, 3.5-megapixel front camera, USB 3.0, and Windows 10 Pro.

Note: This unit doesn't include a pen or keyboard.