You've already found it with the 360 gamepad. Yes, they eventually drift, but by then you've gotten 500 hours of use out of your $40 toy. If you are absolutely concerned with the quality of motion, just buy a new 360 gamepad. Any replacement parts you'll find in the wild are going to be of questionable origin. Maybe they'll be original, maybe they'll be cheap knock-offs. You won't know until you install them and find them to be crap.