Is there anywhere you can get discount lift tickets for Colorado skiing?
Local grocery stores sell discounted lift tickets. Try the Customer Service desk at any Denver Safeway or King Soopers.
Craigslist is also good. Look under For Sale > Tickets. I've bought many tickets this way. Be wary, however, there are scammers out there.
If you know someone in Colorado who has a Colorado Pass, they can get "buddy pass" discounts. Depending on their pass, they can get prices as low as $40 for their friends a few times.
You can always lurk around the ticket windows, too, looking for people selling vouchers and unused tickets. Be careful, though, because sometimes they are bogus and if the resort catches you buying them, they can get pretty pissy about it.