Well...I'm not in Canada but you are SO RIGHT. The SlimFast (I call 'em "SlimFat"

) products are LOADED with sugar - you are right to be concerned!
If you're going to use an MRP (Meal Replacement Powder - I don't recommend the bars as they are all pretty much loaded with sugar - even the so-called 'lo-carb' ones) check the nutritional info and look for something with at least 20 grams of protein and carbs - with little or no sugar grams. I'd recommend going for a protein blend rather than 100% soy or whey, since it's usually higher quality.
OH and also, stay away from the Ready-to-drink (RTD) MRPs as they are sugar bombs as well - besides being WAY expensive.
Here are some brands I can recommend:
EAS' Myoplex Lite (try the Cappuchino Ice - tastes like a Starbucks Frappuchino!)
Met-Rx Lite
Labrada Lean Body for Her
Now I know places in the US you can order these from, but I also know that with the rate of exchange, shipping and CUSTOMS you'll end up paying a small fortune.
Just did a search at
www.leanandstrong.com and came up with some Canadian web places:
http://www.sndcanada.com/gc/gc_page.exe
http://www.supplementscanada.com/
Another option would be to use a high-quality protein powder and add some fruit - like a banana or frozen berries - to the shake (I'd recommend using water rather than milk as milk is mostly lactose - sugar!)
Hope that helps...