I don't know that Ullmark would be available, since he is already signed and they don't quite have another guy ready to replace him. They are at the top of the league for a reason and Ullmark was the superior goalie last season. Saros? No way. Gibson? Maybe, but he has enough runway in him to outlast any rebuild they have.
Every year the Playoffs expose goalie weaknesses, so teams in the hunt will look at options. Does COL ever seem happy? They have a nice backup, but the starter is the usual headcase. Francouz is likely retiring, or so goes the rumour.