As part of our Adat Chaverim Plano III show, we're giving at the door either a box (or a bag) depending on what we feel like doing of cards to everyone who pays our $1 standard donation.
Without overly trying, we are at about 30K cards right now and one gentleman even sent us about 75 1989 Fleer George Kenneth Griffey Jr Rookie Cards. One of our members just donated 10,000 or so cards from his youth and many late 1970's HOFers are in there as well.
Will always take more cards for that purpose and can provide you a tax receipt sheet. We'll take better cards as well