Depends on local conditions. Area slopes can be icy--this is not Colorado skiing (or Switzerland) but it is convenient and can be fun. +/-500 meter verticals. Tickets, rentals, transportation and fees, about ¥18,000 yen ($165/€145).
If overnight, Nagano or Niigata slopes are a little better. They are a four-hour drive--in which case hotel and spa fees and transportation could go up to about ¥40,000 ($350/€315) per person for the trip for one or two days' skiing.