It depends where you’re buying it.
Average price in November 2006 in the USA, in Canadian dollars was about $1.30 per litre for “Jet-A” fuel.
Since that was an average, real prices were lower or higher depending on location. (lowest recorded was 80 cents/L, highest was $1.60).
I’d expect Canadian prices to be similar, but with a wide range as well.
You can’t really shop around for aviation gas unless you’re at a larger airport (and then you can play multiple companies against each other). In smaller markets in Canada, the same problem hits the aviation fuel retailers as gasoline retailers – they all use the same supplier so there isn’t any real competition.
So you’re more likely to get cheaper prices at larger airports that are served by more than one refinery.
That’s from about 15 minutes of looking around – there are numerous sites with US aviation gas prices, but I didn’t find any Canadian ones.