Grocers, wholesalers and close-out specialists benefiting from major discounts on more than $20 million of groceries from retailer-owned co-op in sale conducted by HYPERAMS and Tiger Group. JOLIET, Ill. (6/26/17) — HYPERAMS LLC and Tiger Group are liquidating the inventory of Central Grocers Inc., a retailer-owned cooperative that operated as a wholesaler for approximately 400 independent grocery stores, through an orderly wholesale wind-down sale now underway at the company’