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jay behrenseBay is a good source of cards, but you need to know what you are buying before you do so. The grading companies you can really trust, as far as vintage goes, is SGC, PSA and GAI. Beckett grades some vintage cards, but they are out of the element with them.
If you are going to buy raw cards, it's best to do so in person so that you can get a feel for what real cards look like. Also get to know and deal with trusted dealers. The links are a good place to start. The BST here is also decent way to find cards.
Jay
Growing old is not optional, growing up is.