Costco Sale – Gerry Ladies Tankini Swimsuit by Rhonda May 23, 2021 4/25/17. Comfortable and cute tankini! Costco has the Gerry Ladies 2-Piece Tankini Swimsuit on sale for $19.99 (after manufacturer’s instant rebate), now through May 1, 2017. That is $5 off Costco’s… 0 FacebookTwitterPinterestEmail