Home Slickdeals Costco Furniture Unadvertised Sales for 5/28 onwards. While supplies last. Slickdeals Costco Furniture Unadvertised Sales for 5/28 onwards. While supplies last. By ARCOM - 3 June 2022 49 0 SHARE Facebook Twitter Go to the deal page: Costco Furniture Unadvertised Sales for 5/28 onwards. While supplies last.