Check out the seasonal deals at Waterville Valley, which offers lodging/ski packages at very affordable rates. Lots to do here besides skiing, including snowshoeing, cross-country skiing, sleigh ride, and ice-skating. Waterville Valley also has excellent ski school and child-care programs: http://www.visitwatervillevalley.com/seasonal-packages/

A bit more upscale, but the Balsams at Dixville Notch has its own ski hill, plus other winter activities like snowshoeing, cross-country, and skating. The resort's Grand Adventure Winter Plan combines lodging with unlimited skiing and other equipment rentals starting at $149 mid-week or $169 weekends per person. Not a bad deal, plus you get breakfast and dinner with this. Info at: http://www.thebalsams.com/packages_and_specials/winter