Ending today, Old Navy offers its Old Navy Women's Cami Dress in Black Floral, Black Print, or Light Blue Print for $15. Apply coupons "FASTBUNNY" and "TAKETEN" to drop it to $8.77. With $7 for shipping, that's $18 under list and the lowest total price we could find. It's available in sizes XS to XXL.
Of note, it's also available in solid colors for the same price after the coupons above.