I actually had a set at one time, but right now I've been playing a ton of Paper Mario 64 and the controller has become an official tripwire for my wife. I need to change that reasonably fast.
Of course If I was bored, I could make one if I had a couple of dead controllers. I have a N64 I scrapped out a while back... <shrug> It wouldn't be pretty though.
[ If I had the motivation to match the number of ideas I have, you would have to be afraid... ]