Sheinside offers its Sheinside Women's V-Neck Long Sleeve Slim Bodycon Dress in Red, Black, or Green for $16. Coupon code "SAVINGS33" cuts it to $14.85. With free shipping, that's $7 off list and the lowest total price we could find. It's available in sizes S to XL, although not in all size/color combinations.
This item will ship from mainland China and should arrive in three to four weeks.