Buy one bikini top or bottom and get one free at checkout at Aerie.com. Plus shipping is free. For example, add the pictured DIY Cha Cha Triangle Bikini Top to your cart for $24.95, and then add the the matching DIY Cha Cha Cheeky Bikini Bottom for $19.95 to your cart and the lower priced item will come up free. Mix and match from over 225 bikini tops and bottoms. These are the lowest prices we found based on comparable items. Sales tax is charged in most states.