Hey there,
Most places offer normal massage for 25-30 yuan for 60 minutes – that’s about the average price, I find. As far as the cupping (bahuoguan), it’s traditional Chinese medicine and is meant to cure all sorts of ailments – cold, flu, stomach ailments, etc. Check out the Wikipedia entry on it: Fire cupping on Wikipedia. It’s not painful and the bruises only last for a few days.