SheIn offers its SheIn Women's Sleeveless Color Block Ruffle Piano Dress in Navy for $20.99 with free shipping. That's $13 off list and the lowest total price we could find. It's available in sizes XS to L.

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.