Luuki Luuki via Amazon offers the refurbished SteelSeries Nimbus Wireless Controller for iOS for $34.99. Coupon code "ON96RMRZ" cuts it to $25.89. With free shipping, that's $16 under the lowest price we could find for a new one. It works with Apple TV, iPhone, iPad, and Mac and features Bluetooth 4.1, and a lithium ion rechargeable battery.
Note: A 90-day warranty applies, but it is unclear who backs it.