Bargain Outfitters offers the Guide Gear Men's Ridge North Shorts in Stone (pictured) or Bark for $10.92. Coupon code "BH875" bags free shipping. (After you apply the code, be sure to click the "Ship via Ground" option.) That's the lowest total price we could find by $18. They're available in sizes M to XXL, but not in all size/color combinations.
Note that the pictured belt isn't included.