Amazon offers Prime members the Crocs Women's Sanrah Sandals in Black for $17.29 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.48.) That's $3 under our winter mention and the lowest total price we could find by $4, outside of the mention below. They're available in sizes 5 to 9.

A close price: Crocs has them in Black or Khaki for $19.99 before coupon code "SANRAH4", $12.99 after. Shipping adds $4.99.