EverydaySource via eBay offers the Sliding Bluetooth Keyboard Case for iPhone 4 bundled with a Bumper TPU Rubber Case for iPhone 4 2-Pack for $20.99 with free shipping. That's a buck under our November mention of the keyboard alone and $6 under the lowest total price we could find for these items if purchased separately elsewhere. The cases fit both the AT&T and Verizon iPhone 4 and the sliding keyboard case features a Bluetooth keyboard, built-in rechargable lithium battery, and more.