Urban Outfitters offers the Ecote Women's Strapless Ruffled Mini Dress
in Blue (pictured), Purple or Black for $19.99. Coupon code "WACKSLACKS" cuts it to $17.99
. With $10
for shipping, that's $31 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.