We stayed in the Woods Resort & Spa community right off the access road because it was the only thing that was available. We got a 3br/3ba condo with a loft and it was actually pretty awesome and I would recommend it to others. Our unit slept 10 but we brought a group of 12 and everyone fit perfectly fine and it was about $180/person for 3 nights. With a group that big that's probably right about the average of what you're going to end up paying for a weekend, but try to book it as far in advance as possible so you don't run into availability issues. Initially I used VRBO is Vacation Rentals By Owner
and craigslist to try to find a rental home but eventually gave up and called killington central reservations where you can get a ski & stay package for discounted lodging and lift tickets.