Audiogon is basically just a website of classified ads. They're primarily private sellers, not dealers. I'm sure many of them will ship to Canada.
I paid about $825 for mine.
You won't miss that one extra channel in the rear. I had my system setup with 7.1 (I bought an additional amp) and was never really impressed. I ended up selling the extra amp, and putting my M2i's upstairs on my computer.
I'm always looking for the best possible sound for the least possible money. If I were you, I'd give the RMB-1075 a shot, with 5.1. If you really think you miss that extra channel in the rear, you could always pickup a RB-1070 (or even RB-1050), and power that last channel. It'd still cost you less than buying one of those 200 watt monsters.
Just my two cents. (ok...maybe 5 cents.)
