Tanga offers the Motorola Wireless Bluetooth Keyboard, model no. 89451N, for $15.50 plus $1.99 for shipping. That's the lowest total price we could find by $12, although it was a buck less last week. This full-size keyboard features Bluetooth connectivity, Android shortcut keys, and general compatibility with iOS and Windows, and it requires two AA batteries, included.

Of note: This keyboard has UK keys and a UK keyboard layout (this affects only special characters, not letter and number keys; click here for details).