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I’ve been an enthusiastic thrift shopper since I was 15 years old. And in the three decades (yikes!) since my secondhand adventures began, a lot has changed. TV shows such as “American Pickers” and “Antiques Roadshow” taught the world that real treasure may be collecting dust in our attics and local thrift shops. And in 1995, eBay gave novice entrepreneurs a way to cash in on everything old.