Thanks for all the replies - I snagged a pair of these Kamik "Sledding
" boots size 8 from GAP for $60 shipped. I chose them over the Athletech Toddler Boy's Arctic 3 Winter Boot because these specified a lower temperature rating and waterproof. One of the reviews on the Athletech boots said their son's feet were too cold after 10 min of being in the snow. Wet cold feet make for a crummy day on the slopes, so I hope the additional $30 investment makes the difference. Thanks again for the replies!