Replying to Ski tickets in CO

I'm heading out to Boulder with a whole bunch of people and was talking to this girl who told me that when her friend went out there she walked around to the ski shops to buy tickets for the mountains because it was cheaper that way. I called my friend out there and he didn't know anything about this so I was wondering if anyone on here knew if this was true or if I should just buy my tickets each morning at the mountains.

-Scott