There are several lodging options at Big Sky [1]. Motel rooms, cabins, and condominiums are all available at different elevations on Lone Mountain. During the winter, a shuttle bus runs between all of the lodging spots and the ski lifts.
Room prices are somewhat fluid and can vary greatly by season and by day of the week. Additionally, each place will have different room types available. It’s best to call and see what’s available to fit your needs.
Links:
[1] http://www.moon.com/destinations/montana/the-missouri-headwaters-and-south-central-montana/big-sky-and-the-gallatin-valley/s/big-sky