I have a Stan SX3 four finger medium size, which is perfect for me (I'm 6'-0"). It's in perfect condition and is probably the absolute best thumb button made. The sear is crisp, which is awesome. I just prefer the 3 finger. Asking $155. PM if you're interested.
I am worried about spending a lot. This will be my first thumb release and I am not sure if i will like it. Unless convinced otherwise i think under 100 is my budget.