B&E Collectibles, Thornwood, NY has always been active in buying and selling press pins. I worked with them years ago and remain best friends. This is their site Sports Collectibles, baseball memorabilia, sports collectible
but it's usually better to call and ask since stock changes so much. Let them know Vinny said to call, I see them every week or so since I live nearby.
They know what's real and isn't.