Revolve takes up to 50% off a selection of its Revolve women's dresses as part of its September Dress Sale. Plus, coupon code "CANDY" takes an extra 10% off, which yields starting prices from $27. Better yet, all orders bag free shipping. A couple of best bets, with prices after coupon:
SheIn offers its SheIn Women's V-Neck Tribal Print Shift Dress in Blue for $29.33. Coupon code "CACTUS33" cuts it to $27.36. With free shipping, that's $13 off list and the lowest total price we could find. It's available in sizes S to M.
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.
Sunsmile*2013 via eBay offers this Women's Tank Dress in Rose Red or Blue for $5.99 with free shipping. That's the lowest total price we could find by about a buck. It's available in one size fits most.
Note that this item will arrive in three to eight weeks.