A best bet is to buy two pairs of Express Men's Classic Fit Belted Cargo Shorts in four colors (Back Bay Khaki pictured) for $99.80 before the above coupon, $84.80 after. With $8 for shipping, that's $46.40 per pair, $55 off, and that lowest total price we could find. They're available in sizes 28 to 38, although not in all size/color combinations.
Update: Coupon code "1519" takes an extra $15 off orders of $75 or more. It doesn't stack with the coupon above but yields a better discount on some orders.