Most brands aren't really that much better than another. Snowboarding clothing seems more like a style choice more than anything else. Generally baggier with loud patterns that look different than skiwear.
I don't snowboard, but have bought lots of outdoor clothing and shop based on price. We have local places like a small sporting goods chain that has a great closeout and manufacturers' samples section. Once I got The North Face Gore-Tex wi term pants for $50. We also have The North Face Outlet, but they have limited locations.
I rather like shopping online at Sierra Trading Post and Altrec. They have specials and special offers if you're on their mailing list.