Sundance is $50, I believe
Try $65. Also, Sundance is small and has slow lifts (I'm told -- haven't been there myself).
as are some of the ones in Little Cottonwood canyon
You mean Big Cottonwood Canyon. Brighton used to be pretty cheap, but they're $68 now. I used to take my kids there all the time when they allowed kids under 12 to ski free, and an all-day pass was $36 (at the grocery store). Solitude was always more expensive.
The resort in Little Cottonwood Canyon is Alta. It's $79. It used to be somewhat cheaper, more of a "locals" resort, but it was always more expensive than Brighton. And they don't allow snowboarding.
It depends if you purchase at the slopes or the ski shop, tho.
Yes, you can knock $3-4 off the price if you buy at a shop or a grocery store. Doesn't get you to $50, though. If you're traveling you can get better prices by buying multi-day passes, sometimes with even bigger discounts by getting them as part of a package deal with lodging, etc.
Or if you go a lot there are some great season pass deals, especially if you can go on weekdays. I'm building a house 20 minutes from Snow Basin, and I can get a weekdays-only annual pass for $300. I'll be working from home full-time, too, and have a flexible schedule, so I'm planning to buy a weekdays pass and ride from 9-11 AM most weekday mornings. That will be some cheap snowboarding, especially since I'll get enough hours on the slopes to amortize the equipment costs down to nothing.
So if you live in the right place, and do a lot of it, then skiing/snowboarding can be an inexpensive hobby. The same is probably true of golf.
Don't forget you gotta factor in medical bills when you throw your back out :(
Or you can just not do that :-)
I should note that I now live in Colorado (for another month or two, anyway), and I greatly prefer the skiing in Utah. The Colorado resorts are more expensive and much harder to get to.