SheIn offers its SheIn Women's Halter Contrast Gauze Strapless Bandeau Swimsuit in Black for $29.99. Coupon code "inst33" cuts it to $28.59. With free shipping, that's tied with our mention from two weeks ago, $14 off, and the lowest total price we could find. It's available in sizes M to XL.
Note: Uncheck "Add Shipping Insurance to your order" during checkout to remove the 99 cent fee. This item ships from mainland China and should arrive in three to four weeks.