Lenovo has a Lenovo Bluetooth Tablet Keyboard for $19.99 (Retail: $69.99), Free Shipping. Use eCoupon code: "USP1JU545122". (No space or other characters in code.)

It offers a complete typing experience when touchscreen input alone isn't enough. Keyboard connects electronically via Bluetooth, so that you can more comfortably position your tablet while typing. What's more, the keyboard dock includes a separate battery and power supply so as not to drain your tablet's battery.

While designed to match the Lenovo S6000 / S6000L and become a cover for it, users report using it with iPads and other Bluetooth-enabled devices.