EverydaySource via eBay offers this Bluetooth Wireless Sliding Keyboard Case for iPhone 4 / 4S bundled with a Rubber Bumper Case for iPhone 4 / 4S and an Aluminum Button Bumper Case for iPhone 4 / 4S for $20.99 with free shipping. That's tied with last month's mention of this bundle and $10 under the lowest total price we could find for similar items purchased separately elsewhere. The keyboard includes a retractable USB cable and features a power-saving sleep mode.