I have done some research since I am going to SLC for business on 3/15. I found a hotel in MidVale for $65/night at the La Quinta Inn. Free internet and breakfast. They are right next door to the UTA Ski Bus Station. You can get to Brighton, Solitude and Snowbird round trip for $8. That is what I plan to do
I will be able to go night skiing on 3/15, all day on the 16th at either Brighton, Snowbird or Solitude, and a half day on 3/18 before going home. Not bad for a 4 day business trip!!