Just received some heavy wool pants from an outfit called Sportsmans Guide. The pants are excellent, OD, heavy wool.
I suspect many have seen the comic book style catalogs. The merchandise is reasonably (!) priced, but there are a few pre-cautions. Some of their stuff is in odd sizes. Heavy on the small/xsmall, you have to check for your size.
They have a good return policy and seem accomodating.