Sheinside offers its Sheinside Women's Sleeveless Floral Flare Slim Dress in Pink or Navy for $32.67. Coupon code "INST33" cuts it to $30.71. (Uncheck "add shipping insurance to your order" during checkout to remove the 99 cent shipping fee.) With free shipping, that's $15 off list and the lowest total price we could find. It's available in sizes M and L.
Note: This item ships from mainland China and should arrive in three to four weeks.