A best bet is the Newport Men's Blue Camo Swim Trunks in Blue (pictured) or Sea Green for $29.99 before the coupons above, $23.99 with free shipping after. That's $29 off and the lowest total price we could find. They're available in sizes S to XXL.
Refreshing your swimwear collection? Coupon code "WATER15" cuts an extra 15% off and can be used instead of "SHIPFREE" on orders of $75 or more, which automatically qualify for free shipping. (Only two coupon codes can be used at once; it stacks with the 20% off coupon from above.)