You don't need a budget to make a ski movie. While it does help you should make one for the love of it first and if it is dope maybe some money will trickle in. This makes me sick.
The streets are extremely cheap, if they are good skiers in a area of good skiing I am positive they have friends that have a genny they can borrow, or hit urban during the day, it is actually pretty easy to not get busted.
Pow is also really cheap, you can get a touring setup for $200 bucks not including skis. (I know because I did).
Do it for the love of the sport.