L.L.Bean offers its L.L.Bean Women's Linen/Cotton Shirtdress in Indigo Gray or Linen for $17.99 with free shipping. That's $42 off and the lowest total price we could find. It's available in sizes L and XL only, although not in all size/color combinations.
If you're at least 62 years old, you can score a $10 lifetime pass to America's federal parks and recreational lands. But act quickly because fees are about to jump.