Target offers the Mossimo Supply Co. Men's Belted Cargo Shorts in Zodiac Night or Alamo for $8.04. Opt for in-store pickup to avoid the $4 shipping charge. That's $15 off list and the lowest price we could find. They're available in sizes 28 to 40 to 42, although not in all size/color combinations.
Walmart offers the Fruit of the Loom Men's Short Leg Boxer Briefs 5-Pack in Black/Grey for $12.49. (Target charges the same for a different color selection.) Opt for in-store pickup to avoid the $5.99 shipping charge. That's tied with our mention from a week ago and the best price we could find by $11. They come in sizes S to XL.