Shiga Kogen Shopping
Shiga Kogen is not known for its shopping facilities; come prepared! There are not many shops selling ski gear, so if you are looking to purchase your own, best do it in Tokyo before arriving. Most hotels have their own, or nearby ski and snowboard rental equipment shops.
As far as grocery shopping goes, there are a few stores inside hotels selling a variety of snacks and souvenirs, but not anything resembling a supermarket.