Spanx cuts up to 50% offsale items. (Click through the "Sale" tab.) Even better, take an extra 25% off via coupon code "JULY25". Plus, the same coupon bags free shipping. Coupon expires July 31. Some best bets, with prices after discount:
6pm offers the Reebok Women's Wor Mesh Full-Zip Top for $24.99 in Blue Bomb, Black, or Punch Pink with free shipping. That's $15 off and the lowest total price we could find. It's available in sizes from S to XL.