I hadn't seen this one before. GetSkiTickets.com is an online travel agency specializing in skiing. It looks like you can buy discount lift tickets in advance, or, being a travel agency, they can set you up with lodging, rentals....maybe even airfare.
I have not done business with them, so use at your own risk, your mileage may vary, etc. etc.
Maybe someday I'll get around to comparing them with some of the other online discounters.