Stabo,

I bought it from a Japanese Auto parts for $24...Auto One sells it for $24 also, Repco is about $26. You can also buy the gasket for it or just re-use the old one if it is still in a good condition. I know its better to buy new gaskets. I think its only about $5 anyways.

Yeah apparently when the thermostat goes bad and its always on cold, the car is always in warm up mode, which means its running rich, and also Vtec would sometimes not engage.