Sold out now.
Mountain Sports Club may still have "free lift tickets" available with membership (a month ago you could get 3x Berkshire East passes with a card for $99, but it sold out quickly), but the Ride and Ski NE card is much better (50% off instead of BOGOs and more options). Last year they were giving away "free" passes to a variety of places at the Boston Ski Show, which is essentially when it goes on sale. If I recall, I showed up on a later day of the ski show and no more free passes were available.
The passes weren't exactly free anyway but like add an extra $15 so worth it if you like their options.