The good news: once you get on the line our hotels are very good indeed. Kudos to the Hotel Committee.

A couple of us stayed here: https://www.woodspring.com/extended-...denver-airport

I think we got them down to <$45/night last winter. It's a little sketchy, but a hotel room nonetheless.
Some folks AirB&B'd with success, a couple were in crash pads. They didn't look happy..
If money isn't as much as a concern, the Wooleys https://www.woolleysclassicsuites.com is where we generally stay for further training...
Sadly with so many varying budgets its hard for the company to help much; but use the Frontier name when booking, It can help a litte around the airport in Denver.

Good luck in class!