Is it the fact that we never leave this great treasure trove empty-handed? Is it that the friendly staff routinely tips us off to sales at other, nearby antique stores? Is it the fact that this place shares a parking lot with Flo's, one of the best thrift stores in town? When you're talking Zinnias on Melrose, the answer is "yes" to all. This 15,000-square-foot vintage-and-collectibles mall features 36 different vendors, where bargain hunters have scored everything from a 1950s chrome dining set to a pair of chandelier earrings once worn by Mama Cass on the Tonight Show. Proprietor Michael Robertson knows the business: He grew up in his great-grandparents' antique shop and has been scouting estate sales across the nation for decades. He hauls his fab finds back to Phoenix, and we're grateful he does.