Inexpensive way to waterproof a Nikon D5100?

Hey I'm going to a snowboarding trip real soon. And I'm looking to take some footage. Now I'm looking for a cheap way to safely protect my camera from water. I'm not going to be riding w/ it and take footage. So I was wondering if there's a cheap way to safely protect my camera from the snow?
Plastic bags like a Zip?
I have already looked at items like the Aqua Pac and ewa-marine (Way out of my price range)
By cheap I mean no more than $100.

When I'm shooting in the rain, I use RainSleeves (2 for $6.00 on Amazon)

Snow is not a problem either if you use RainSleeves

If you wanted to dive with the camera, then you are looking at an underwater housing and those cost around $2, 500 or more

Certainly the cheapest would be a zip but you're still going to have to have part of your lens exposed for focus.

My advise is to leave the camera home but hey… Your choice - wet = forget.