There are tickets available in very limited quantity. NHL rules state that 2300 tickets have to be available for the opposing team, and these tickets are released to the public at unknown times / unannounced usually.
So in very limited numbers (meaning if you are looking for one ticket alone) you may have a chance to still see the game. The same should be the truth for Game 2 if you could not get tickets.
(information was found on Sunshine Network's message board and this webmaster has to wonder how many people will harp that the Lightning didn't sell out their games until today after seeing this post :tongue)