The Comfort Inn Missoula also across the river from campus has 15 or so rooms that will be available for $94 per night, similar arrangement, but conference participants can book these if available up to and including the day of the conference.

The Double Tree Inn Missoula immediately across the river from campus:  we suggest that you ask for the “state rate
when making a reservation – tell them that you are attending the conference.  (Their block reservation expired on March 30.)