Antiques, vintage, collectibles, new merchandise, clothing, jewelry, books, tools, toys, gourmet food, furniture, produce & more! Rosemont's outdoor market has 700+ vendors! Rosemont every Sunday April thru October 6am-3pm. Food court, free parking and ATM. $2 adults, $1 kids 6-12 and seniors. Under 6 free. WOLFF'S FLEA MARKET is a family owned business: CELEBRATING 25 YEARS! 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 operated previous markets in Mt. Prospect, Rolling Meadows and Melrose Park.