Walmart offers the Russell Men's L2 Active BaseLayer Thermal Pants in Greystone/White Flame Heather or Rich Black for $9. Opt for in-store pickup to dodge the $5.99 shipping fee. That's $3 off and the lowest price we could find. They're available in sizes M to XL.
Believe it or not, there are lots of things Uncle Sam can't touch — so long as you play by the rules.