Discounted tickets can be found, but you have to search. You won't find them at the grocery stores or in coupon books like some other resorts.
The best and easiest way to get discounted lift tickets is to purchase them through your hotel concierge or reservation agent. The ski company gives lodges the ability to 'package' lift tickets to their guests at some pretty steep discounts - of course, it depends on what time of year you are staying and how many days you are skiing. You won't find discounts for one or two days of skiing.
Or try a ski tour operator such as Ski.com, Overstock.com or an on-line retailer such as Travelocity or Expedia. Often they have negotiated lift ticket pricing as well (but you probably have to purchase lodging as well).