BStock offers the Ion Audio iCADE Mobile Game Controller for iPhone in Black, model no. ICG07, for $5.99 plus $6 for shipping. That's the lowest total price we could find by $10, although we saw it for $5 less in September. It fits the iPhone 3G, 3GS, 4, and 4S, as well as the 2nd-generation iPod touch, and features Bluetooth, buttons, a D-pad, and rotating cradle. It requires two AA batteries (included).