SheIn offers its SheIn Women's Halter Cut Out Bodycon Dress in Black for $19.69 with free shipping. That's $12 off list and the lowest total price we could find. It's available in sizes L and 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.