When I get too many of them, I trade mine to a case-breaker I know for some cards he's trying to sell. Mine aren't usually in too bad of shape either.
I can help you make the shipping cheaper though. Go to usps.com and order some Flat Rate Priority Regional boxes (A and B). They hold more than a Medium FR and cost only $6.60 to ship. The Regional A is good up to 15 pounds and the B is good for 20 pounds. They can't go cross-country though. I've used them twice and stuffed them full of toploaders of all sizes, penny sleeves and team bags and only got to about 6lbs. of weight. And I saved $7 each time.
NO PWE's EVER!!! PLZ PM me 1st before sending any offer. ONLY selling cards as of March 2024. No trades or purchases right now.
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Largest total PC card collections by Team, then Athlete (as of 3/22/24):
STL Cardinals (MLB) - 8810; Carolina Panthers - 2888; GB Packers - 1790+ cards
Mark Martin (NASCAR) - 2038 cards; Jimmie Johnson (NASCAR) - 1875 cards; Jeff Gordon (NASCAR) - 1594; Ricky Rudd (NASCAR) - 839; Ozzie Smith (MLB) - 707