With all the repacks I bust, I naturally have quite a few extras and dupes that come out of them. Some get used as filler/extra cards when I send out mailers/trade packages. Some go to COMC.
But most end up here.
I put the cards into groups of about 60-65 each, then put them into team bags, and donate them. I try to keep a similar breakdown in content for each bag. They're pretty popular among the children there, who love to trade them with each other.