You could sell them to various stores that could take them...such as Toys R Us (for the games), GameStop (the games, they don't take DVDs anymore), GameCrazy (same as before)...or maybe MovieStop (the equivalent of GameStop but with movies).
But the catch for most of these quick sales will be they would most likely want you to take credit over cash so there might be some sort of penalty for taking cash...like reduction in value of the games etc. etc.