Canadiens tickets are easy to get. But as my friend Rick Blaine said to Ugarte, "For a price, Ugarte, for a price."
I second the recommendations made by others to consider using Stubhub and scalpers. I attended a Canadiens game with a friend last year and I bought two tickets from a scalper in the lower seats, red section, four rows back from the ice right behind one goal. I think I paid $120 CDN each (about $90 US) Whatever it was, it was less than the face value of the tickets.
It was a midweek game late in the season vs. Minnesota and the Canadiens were having a poor season with almost no chance to make the playoffs. Those factors definitely affected the price (in my favor). Despite the bad performance of the team (though they won that night), the Bell Centre was mostly full and it was a great experience. I'm not a hardcore hockey fan but I enjoy the sport and appreciate its importance to the city.
The team is doing much better this year so general demand for tickets is probably higher than last year. The supply-demand situation is also affected by the day of the week and the opponent. Prices will be higher for a Sat. night game vs. the Bruins or Leafs than for a Tuesday night game vs. Minnesota or Colorado.
There are lots of scalpers and though they seem somewhat aggressive and a little sketchy, I think they are generally honest and fairly trustworthy. After all, they do this for every game and they can't afford to rip people off and stay in business. The scalpers as a group have an interest in keeping up their reputation as honest brokers.
My approach to them was to talk to a few on the day before the game (some gather outside the Bell Centre the day before) and get an idea of market prices. I printed out and brought with me a color coded map of the arena so that I could see precise locations of seats that were for sale. i got a feel for market prices so that I would be ready to buy the next day, the day of the game. I returned on the day of the game about an hour before the start of the game and wound up buying seats about 30 minutes before the start of the game.
Given a tighter market this year, you might not want to wait until just before the start of the game. Decide how much you can pay and when you get a deal that matches your preferences take it, whether it's 30 minutes before the game or 3 hours before the game.
If you don't like dealing with the scalpers (I can kind of like it) then Stubhub is a very good and trustworthy option. You may pay a little more (or maybe even less) than with a scalper, but you will waste less time searching for tickets.
Searching for good Canadiens tickets is a little like searching for a good escort. As Voltaire said: the perfect is the enemy of the good. You won't find perfect tickets or a perfect escort. But do your research and you will be able to recognize a good deal in either tickets or an escort.