iBU is a student-run initiative that does what they call "textbook consignment," where you name a price for your book or iClicker, hand it over to them, then they sell it. 80 per cent of the profit goes back to you, and 20 per cent goes to the BC Children's Hospital Foundation. If they don't sell it, you get it back, no charge.
They've set up a store on the second floor of the new SUB in room 2528, and they'll be there until September 15. At a university where textbooks are ludicrously priced (so, any university) this is another great option for getting a better rate.
If you're lazy and/or want to feel good about donating a little bit to an extremely deserving charity, this seems like a no-brainer. Check out their Facebook page or FAQ for more info.