SheIn offers its SheIn Women's Long Sleeve Slim Wiggle Dress in Black, Light Grey, or Dark Gray from $13.99 with free shipping. That's as much as $12 off list and the lowest total price we could find. It's available in sizes XS to L, although not in all size/color combinations.

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.