$40 will get you a great Xbox 360 arcade controller (and some drum pads to go with it).
Still looking for the perfect Xbox 360 d-pad for all those Live Arcade classics? Well Ars Technica may have stumbled on the answer, although it's not the most efficient (or cheapest) solution: Turns out the Mad Catz Portable Drum Kit just happens to have a d-pad controller remarkably similar to an old Super Nintendo pad.