Second-Hand Ski Clothes
on used kids' ski clothes: the goodwill store on university between milvia and oxford has a pretty good selection of them in all sizes.
You might check Ross stores. Last year I got a nice down jumpsuit for my six year old son for only $35, at Berkeley Ross. It is hit or miss, but this is the time of year to look.
I found some used snow clothes right before Christmas (the height of the ski season!), at two used clothing shops in Walnut Creek: the American Cancer Society Discovery Shop, and Katie's Closet. The selection and prices at Katie's Closet were better.