Amazon offers the Crocs Unisex Hilo Flip Flops in Black, Mahogany, or Navy starting from $10.31. (Prices vary based on size and color.) Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.48.) That's the lowest total price we could find by as much as $8. They're available in men's sizes 4 to 13 and women's sizes 6 to 15.

Update: Prices now start from $12.07.