Getting rid of old video games that aren't popular anymore?

I've tried to sell them to gamestop, my local trading shop and even the pawn broker. Nobody wants these games, I don't have them at hand but they were generally popular for their time, some from XBOX and some from Ps2. An example of two of the games are Dragonball Z: Budoki (however it's spelled) and Marvel Nemesis: Rise of The Imperfects. There are many more like that but most aren't in their original packages... Yard sales aren't a possiblity in my living situation...any tips or hints or is this a futil attempt?