Michel,
Dyna-Gro Grow 7-9-5 is a good complete fertilizer for orchids - mostly urea-free nitrogen source, contains all trace elements, and it has calcium/magnesium if you have particularly soft water. You can find it at a variety of places, but here are two that I've purchased from:
Paramount Orchids:Main
Bustan - Toronto Hydroponics Grow Lights Nutrients Hydroponic Supplies Canada
It's also available at most any hydroponics store in urban centres.
About two years ago I switched to MSU-type fertilizer in dry powdered form. I find it cheaper than liquid concentrate fertilizers in the long run. I haven't yet found a Canadian source for it but there are several US sources that ship to Canada without any fuss. It's also almost always available at orchid society meetings.