Nike offers its Nike Women's Zoom Crusader in Purple for $89.97 with free shipping. That's $20 under the lowest total price we could find for any other color elsewhere. They're available in most sizes from 6 to 9 10.
Art of Deals via eBay offers the Foxy Women's Gladiator Sandals in four colors (Purple pictured) for $7.99 with free shipping. That's the lowest total price we could find by $2. They're available in sizes 5 to 10, although not in all size/color combinations.