L.L.Bean offers its L.L.Bean Women's Premium Washable Linen Dress in Cirrus Blue or Mallard Green for $29.99 with free shipping. That's $30 off and the lowest price we could find. It's available in petite and regular sizes 4 to 20, although not in all size/color combinations.
Avenue offers its Avenue Women's Leaf Cutout Handerchief Hem Dress in Green Print for $19.96. Opt for $4.95 ship-to-store pickup to avoid the $7.95 shipping fee. That's $40 off and the lowest total price we could find. It's available in sizes 14/16 to 26/28.