Right now at Second Spin, all DVDs and CDs are automatically 25% off (no code needed; discounts reflected in the product listings). The savings are good through January 22nd, 2009.
Do you care about this sort of thing being second-hand? Only if you really enjoy paying full price for stuff, I’m guessing. I mean, low prices, then 25% more off of that? It tends to soothe any disgruntled feelings I might have about not being the first person to crack the seal on the case.