If I'm getting a really good price on it (like the buy one, get one free on $18.99 and under games at Game Crazy on Black Friday), I'm not really going to complain. But my biggest issue with it is that you just don't know. I really hate buying a "new" game as a gift for someone and then...
There was only a tiny crate of crappy GBA games marked as being on sale at my Kmart. I had to fight with the salesperson just to get her to scan the Metrioid Prime/Wavebird bundle, but it came up as $15.99. :)