Costco: 8-Piece Stackable Acrylic Tumblers $8.99 by Rhonda July 24, 2020 July 24, 2020 *UPDATE* 4/10/14. Costco has the 8-Piece Stackable Acrylic Tumblers on sale for $8.99 (after manufacturer’s instant rebate), now through April 20, 2014. That is $3 off Costco’s regular price of $11.99. This… 0 FacebookTwitterPinterestEmail