JNTO has some great information on skiing in Japan.
https://www.jnto.org.au/experience/ski/
Here is an article on snowboarding in Japan on a budget
http://snowboarding.transworld.net/photos/how-to-plan-your-dream-trip-to-snowboard-in-japan-on-a-budget/#DiDgQXZDieXDzjp9.97