Inateck Online via Amazon offers Prime members the Inateck Wireless Bluetooth 3.0 Keyboard in Black for $26.99. Coupon code "UCDKD237" cuts the price to $21.99. With free shipping, that's $18 off list and the lowest total price we could find. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $6.70.) It's compatible with most Apple, Android, or Windows devices and features Li-ionic accumulators for charging the battery.