ShoeMall offers the GBX Men's 13391 Boots
in Black (pictured) or Khaki
Coupon code "SAVE20" drops them to $38.39.
With free shipping, that's the lowest total price we could find by $32. They're available in most sizes from 8 to 13, although not in all size/color combinations.
Coupon ends March 12.
Update: Coupon code "WELCOME25" drops it to $35.99 with free shipping.