This Bikini Set, originally $17.99, drops to $9.89 when you enter the promo code 45866A5R during checkout at Didk via Amazon. Shipping is free when you use a Prime account or free Prime trial. Shipping is also free when you spend $25 or more. Otherwise, it adds $5.99. We couldn't find this deal anywhere else, but similar bikinis start at $24. This come in multiple colors in sizes S-XL. Note that this price is for the pictured option, but you can get a similar discount on the other colors and sizes by using the same code. Sales tax is charged in most states.