Free: Contests & Raffles.
Dont take them to Cabelas. They will only give you about 25% value.
If you had a list of makes and models of what he is wanting to sell you might post them on here? Interested parties could maybe contact him? Otherwise I know of folks who have good experiences with Pintos but he will likely get a bit more by selling them personally. I guess it depends on if he wants to get rid of them quicker for less money and less time meeting others at an FFL