Razer has launched a new Xbox 360 controller known as the Sabertooth. The device looks very similar to the Microsoft Xbox controller, save for the fact it features six extra buttons. It has the normal buttons all in the same locations and could easily be mistaken as a normal controller.
It's currently available in the UK and US for £69.99/$79.99 and comes with a carrying case and a detachable cable. Two buttons are on the shoulder, two are on the undercarriage, and two are beside the OLED screen. It's not clear if the device features any sort of rapid fire or other mods.
There are multiple reviews on the Internet should you find yourself interested in buying one.