Crocs via eBay offers the Crocs Unisex Hilo Flip Flops in Black, Mahogany, or Navy for $14.99 with free shipping. (6pm via Amazon charges the same in select sizes for Prime members.) That's the lowest total price we could find by $10, although we saw some styles for $3 less in March. They're available in select men's sizes 4 to 19 and women's sizes 6 to 11.