What price are you willing to pay?
It sounds like you want to do it on the cheap but here are links to two of the products available on the market at present.
Groovy Game Gear's Turbo Twist 2 [
Link]
Ultimarc's SpinTrak [
Link]
Im guessing you have seen those already though (if you have searched)
Just make sure whatever spinner you buy will perform the way you want it too. There are some things you just cant cheap out on. Make sure you research the available options before you make your choice.