Yeah, the cashier at the bookstore mistakenly sold me one of these for Phys 121. I would return it, but the box is in a dumpster somewhere, so I'm looking to get rid of it here. The thing is pretty much brand new, and only $20 (they're sold for $33).
If you're interested, just reply to this thread and we can discuss payment via IM/email.
***Note: Despite all the responses, the item is still available if anyone wants it.