SheIn offers its SheIn Women's Off-the-Shoulder Ruffle Tassel Tube Dress in White for $11.79 with free shipping. That's $18 off list and the lowest total price we could find. It's available in sizes S to XL.

Note: It's also available in Black for $12.48 with free shipping. Uncheck "Add Shipping Insurance to your order" during checkout to remove the 99-cent fee.