Most of the libraries should have them near the printing centers or just at the front desks; you can also ask a prof for one especially if it's a small class! For the future, I absolutely suggest getting a mini stapler... no point getting a full size one, and the mini ones are just adorable! and so easy to keep by your desk. (I've got this one for $6, same-day delivery, 1000 staples -- https://www.amazon.com/dp/B008DQY89M)