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When hairstylist Gregorio Ruggeri and interior designer Craig Longhurst brought their salon from Australia to Manhattan, they decided to sell more than just blowouts and blonde highlights. “People would always ask us, ‘Where did you get this or that?’ and we started thinking, What if you could actually buy everything—the artwork, the couch?” says Ruggeri, who now sells vintage jewelry and pricey housewares almost as often as haircuts and balayage…