REI offers its REI Men's Bolongo Board Shorts in Black or Midnight Blue for $23.83. Opt for in-store pickup to dodge the $5.99 shipping charge. That's $26 off list and the lowest total price we could find. They're available in sizes L or XL, although not in all size/color combinations.
Crocs via eBay offers the Crocs Unisex Modi Sport Realtree Max-4 Flip Flops in Chocolate/Khaki for $22.99 with free shipping. That's the best price we could find by $9. They're available in select men's sizes from 4 to 15 and women's sizes from 6 to 10 12.