Costco Sale: 8-Piece Polka Dot Acrylic Tumbler Set $11.99 by Rhonda July 24, 2020 3/10/14. Costco has a very cute 8-Piece Polka Dot Acrylic Tumbler Set on sale for $11.99 (after manufacturer’s instant rebate), now through March 16, 2014. That is $4 off Costco’s regular … 0 FacebookTwitterPinterestEmail