idler pully ?

i got a 96 2.2 with an idler pully that is also the tensioner pully. my pully is a little worped how much could a new one cost ? can i just drive with it it sometimes makes a clickinh nose (i know is the pully casue i ran the car with out the belt and the engine is good)

I would start at Autozone or pepboys(sp) and if no luck there, the dealership.