Costco Sale: H2O Go! Beach Ball 2-Pk $14.99 by Rhonda July 16, 2020 *UPDATE* 6/23/19. These beach balls are 5-feet when inflated! Select Costco locations have the H2O Go! Beach Ball 2-Pack on sale for $14.99 (after instant savings), now through June 25, … 1 FacebookTwitterPinterestEmail