Pete, you should have offered him $100 for the 51 Mantle... just to see the look on his face.
There's a coin shop by me. The owner has a few baseball items and they are all a bit expensive. He has a complete (maybe not all the variations) P2 set. I think the asking price was about double what it's valued at.
There used to be a few really good card shops where I live but only one is still around and they mostly do mail order.