Hype Mini Bluetooth Keyboard for Bluetooth Enabled Phones & Tablets for $9.99 shipped.  It is sold by 1saeaday through ebay.  Here is a screenshot for your reference.  This wireless keyboard works with Bluetooth enabled phones and tablets with soft-touch sensitive keys, rechargeable battery, 45-hour battery life, 23-days standby time, wireless 2.4GHz frequency, and more.