Awesome article. I once bought an NES with Dr. Mario and River City Ransom for only $5. Same person sold me my beloved keyboard for another $5.
I would also suggest going to flea markets if you have any nearby. They can also have good deals, but you might have to dig around a bit there to find...
Being 30 minutes from the nearest Best Buy here in Toledo, and considering that the Internet knows all about this and I have classes tomorrow all day, it's pretty much not worth it to go and shop for these deals. They'll end up on eBay at the normal retail price anyways.
Nothing of note except Metal Gear Solid 3 for 9.99 and Under The Skin at 14.99 at my local K-Mart. The rest were all movie franchise games or kind of worthless buys.