Cost to replace a wheel bearing ?

I believe the wheel bearing in the right rear is on its way out as there is alot of noise coming from the rear of the car. Does anyone have an idea of how much the part and labor will cost. I don't have a bearing press so its not something I will be able to do on my own.

thanks,

2-3 hours for a shop? The part is around a 100$ i think. (I'm pulling numbers out of the air :) ) OH wait... i was thinking about the front... No idea whats involved on the rear....