Casey DeSmith for a late pick
Unless it's a long term injury to Francouz, I don't think they'd be looking to add somebody making a large amount. If/when Francouz was cleared, then they'd have an expensive #3 goalie which would hamper their cap situation.
Aside from picking up a guy like Halak as a free agent, a cheap waiver pickup might be more plausible. As mentioned Martin Jones could work. Other cheap goalies (with varying degrees of NHL experience) who could hit the waiver wire: Alex Stalock, David Rittich, Malcolm Subban, Collin Delia, Anthony Stolarz, Louis Domingue, Magnus Hellberg, Keith Kinkaid (they briefly had him last year).