I'd say eBay is your best bet. The ones that are worth it you sell for 2 dollars and up plus $3 shipping. Ones that aren't worth that much put it in big bundles (20+) and do like a buck each.
At least over here yard sales have to sell them at like 75 cents to a buck each to move them. Unless someone just uses PDA and cherry picks them.
C-list is usually gets like the same 75 cents to a buck each if you want to move them (again, aside from the cherry pickers)
I sell alot of stuff on eBay - so I generally use that and it works out well. You might find you have a few random OOP ones worth 10, 15, 20 or more. I bought a bundle of C-list last year and one was worth 120.
Just make sure to search completed auctions and see how many sold vs. listed. If like 3 sold that last 4 months and there are 200 listed you don't have much of a chance.