Amazon offers Prime members the Crocs Men's Walu Express Loafers in Espresso, Khaki/Mushroom, or Black with prices starting from $21 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.48.) Excluding the below mention, that's the lowest total price we could find by as much as $19. They're available in whole sizes from 7 to 13, although not in all size/color combinations.

A close price: Shoes on the Web has them in Black, Espresso, or Khaki/Mushroom for $21.22 with free shipping. They come in wholes sizes from 8 to 13, although not in all size/color combinations.