A bag-it-yourself grocery chain with an emphasis on a big selection at low prices is moving into the Spokane marketplace. WinCo Foods Inc., which operates 57 stores in Washington, Idaho, Nevada, California and Oregon, plans to build a 94,000-square foot warehouse-style grocery store in north Spokane, on Nevada Street, and Holland Avenue, east of the Wal-Mart Supercenter on Colton Street.