Pretty cheap, really. Other copy services are available on campus that you can charge to your account, but be careful.
Some services are expensive.
For a low cost per copy, you can give your machine feedable originals to the operator in the 3rd floor Muir Copy Center. Fill out their copy request form, include the budget number, and have the billing copy go to Molly Love, CSE dept. Some services are extremely overpriced. Roughly every month, I'll send out a balance statement to all members.