The Blue String Bikini is 50% off at Express.com, dropping from $49.80 to $24.90. Shipping and returns on swimwear at Express are free. This bikini comes in sizes XS-L while supplies last, and you can purchase the top and bottom separately to accommodate your size needs. All Express swimwear is 50% off right now, with most prices in the $12.45 - $19.95 range for tops and bottoms. Sales tax is charged in most states.