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When comc was new I bought a bunch of Topps Tek golds pretty cheap as well as a couple 90s Jeter inserts with low print runs. I was able to sell them for a nice profit. I also picked up a vintage Colgan's Chip card of a low profile player for $7ish. Turned out the team listed on the card was a rarer version that a set collector needed. I was able to get $100 for it and he was happy to pay it.