Duluth Trading Co. offers its Duluth Trading Co. Men's Dry on the Fly Nylon Cargo Pants in Gravel for $59.99 with free shipping. That's $10 off and the lowest total price we could find. They feature built-in UPF 40 protection and are available in sizes M to XXL, with inseams lengths 32 to 36, but not in all size/inseam combinations.
The planet will thank you, your local (overwhelmed) landfill will thank you. Even your budget will thank you.