Wolff's Flea Market is a family owned business, now celebrating its 25th Anniversary. Since 1991 it has operated Sundays April through October in Rosemont at the Allstate Arena. With the support of their parents, Katherine and Lawrence Wolff, and sister Eileen, brothers Donald and David Wolff built Wolff's Flea Market into the premier family-friendly shopping destination for Chicagoland bargain shoppers and small business entrepreneurs. It boasts 700+ vendors and 12,000+ customers. Wolff’s has previously operated indoor markets in Mt. Prospect, Rolling Meadows and Melrose Park. In November 2009, Wolff’s opened its year-round saturday/Sunday indoor market at 1775 N. Rand Rd., Palatine with 300+ vendors.