A heck of a lot cheaper than a car clutch, and if you are mechanically inclined, you can more than likely do the job at home with the service manual. The Honda parts dept will have a price for parts. By the way, you didn't put car oil in the crankcase did you? If the oil is slicker than what's supposed to be in there that clutch will slip forever.
Make sure to adjust enough freeplay on the clutch cable before you start shelling out money.