TheGoodBlokes via eBay offers the Microsoft Surface Type / Touch Cover Bluetooth Adapter
, model no. Q6W-00001, for $19.99
with free shipping
. That's $7 under our April mention, the best now by $5, and the lowest total price we've seen. The adapter connects any Surface cover to your device via Bluetooth so that you can control your Surface from a distance. It's compatible with the Surface RT, Surface 2, Surface Pro, Surface Pro 2, Surface 3, and Surface Pro 3.