For those on a budget, The House and Sierra are frequently cited for flash sales and outlet items. SkiEssentials also offers a "Bargain Basement" for significant spring closeout deals.
REI Co-op focuses primarily on resort gear and is known for its excellent member benefits, including a one-year return policy and dividends on purchases.
Backcountry has a strong focus on high-end, off-piste equipment. Their "Gearheads" are available for expert product advice via chat.