Costco Sale: Wham-O Aqua Force Water Balloon Launcher Bow 2-Pk $13.99 by Rhonda July 16, 2020 *UPDATE* 7/23/17. This toy is intended for target practice and outside, open field launching, not for water balloon fights. Costco has the Wham-O Aqua Force Water Balloon Launcher Bow 2-Pack on … 0 FacebookTwitterPinterestEmail