A best bet is the American Apparel Women's Baby Rib Crop T in six colors (Orange pictured) for $8 before the above coupon, $3 with free shipping after. That's $17 off and the lowest total price we could find. It's available in sizes S to L, although not in all size/color combinations.
Need it for Christmas? Choose express shipping for $20 and place your order by December 22 at 3 pm ET for guaranteed delivery.
Update: The site will not allow you to checkout with a $0 balance. We regret the error.