Macy's offers the Rachel Rachel Roy Women's Estee Combo Slip Dress in Black or Chambray for $19.96. Pad your order with a beauty item (they start at $3) to bag free shipping; otherwise, shipping adds $10.95. That's $79 off list and the lowest price we could find. It's available in select sizes from XS to XXL.
These freebies are available to anyone with an internet connection, including both Amazon Prime members and nonmembers.