It really depends on what kind of games you're trying to sell. If they're all sports titles, then you have to figure that if they're prior year versions that the value for them is going to be $5-7 at MOST.
But if you have stuff like the Uncharted games and some of the better titles from launch or since, then you could likely get away with doing a bundle that gives you $10 each for the games in it.
As for pricing them seperately, unless you plan on having the CL buyers come right to your house to grab them from you(not a safe idea imo) then I would factor in at least another $2-3 for gas to go meet them in a well lit public place like a mall.
It would definitely help us to let you know what you could expect for the games if we knew what they were. Heck. Someone on here might even make an offer for a couple of them if they're in great shape and complete.