That's tough. It costs a lot of money to ski out here, and there aren't a lot of student discounts. You can ski loveland way cheaper than everywhere else, you can get a loveland card for something like 30 bucks and if your here in a week or two it comes with a free lift ticket. After that you get real cheap lift tickets, like under 40 bucks. I don't know of a single colorado resort that has student discounts, but there may be one.
You should probably pre-buy your tickets for vail, go to
http://vail.snow.com/pb.lifttickets.asp and drop your jaw at how expensive it still is. If you get lodging from vail they'll discount you as well at
http://reservations.snow.com/index.asp. Yes this place is rediculously expensive, but don't come to CO and not ride there at least once.
This may sound silly, but you might make out better actually buying an Arapahoe Basin bonus seasons pass. For $230 you get unlimited at A-Basin plus 5 days at keystone & breck, one of which can be used at vail. So you could spend a day at vail, 2 at keystone, 2 at breck, and the rest at abasin. Something to think about. But you might take that one day at vail and really wish you could go back the next day. Also, you can spend a day at breck and use the same lift ticket for night skiing at keystone, if your legs can take it. If you fly united, you can get a free lift ticket to Vail. I think united.com/ski, there should be a link at vails website.
Basically, there aren't any real good deals out here that i've found. But if you buy ahead of time its comperable to what you'd pay back east. The resorts don't need to entice people with deals, they're packed to the brim already...
Good Luck