Best Place to Buy/Sell Cards?

As you can see, i am a new member and i am excited about conversing with people who really know an abundance about sportscards. I have quite a large inventory of baseball/football cards but one day those will sell and it will be time re-stock. My question to you sportscard sellers out there is where do yall buy your cards for cheap enough prices and where do you sell them to make a respectable profit. Over the years i have bought my cards at estate sales, but they were always a rare find. I also used eBay to sell them. Where are yall's best buying and selling locations?
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Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.
Edited to say: Not accusing you of anything. Some of your questions are fairly rudimentary - which is great. Love seeing new people in the hobby - but if I were an exiled former member, I would come back to the board and try to throw people off by coming off as a newbie. If not, no biggie, just figured I'd ask. Welcome to the board.
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If looking for an investment, I would go gold and silver for about another year....then pull out.
Clear Skies,
Mark
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.
I don't sell cards very often, but when I do, it's on ebay. If you have a decent assortment of cards, you could set up as a seller at a local card show, or just put them on ebay. I know of a few people who buy unopened boxes of new cards at their local card shop, and then bust them and sell the individual cards on ebay.
Many people seem to make a comfortable living buying cards and then reselling them, but before you do so, you need to make sure you study and gain the necessary knowledge. It won't do you any good to jump in with both feet, and buy cards that end up being overgraded or overpriced by the person you're buying them from. The trick is to buy undergraded/underpriced cards, and then turn them around for a profit. It's much easier said than done.
Steve
Wrestling, or Harry Potter cards for 10-25 cents a piece can go a long ways quickly. Can also move base cards like Jeter, Pujols, Wright, and whoever the local heroes are.
MetalMike may have something to say on flea markets. I know he sells at them often.