6pm offers the Skechers Sport Cooling Gel 1-Strap Thong Sandals in White/Pink or Charcoal/Aqua for $16.99 with free shipping. That's the lowest total price we could find by $6. They're available in select sizes from 5 to 11, although not in all size/color combinations.

Update: Today only, coupon code "6PMEU10120141028" cuts the price to $15.29.