Hi Ken,
I haven't found a source in Canada yet for getting "Mucuna or Zandopa". As far as customs, I never had a problem and I was never charged any duty. I was advised (by a herbalist) to keep the order small (under 6 jars). If you order to much, customs might think you're going to resale it. Besides you shouldn't order more than a 3 month supply anyway, because you want to keep it fresh. I keep my supply in the fridge (cold dark place). I still use the mucuna tablets too, when I'm not home. It's a lot easier. So far after 19 months of using "mucuna", I'm still doing pretty good. I'm haven't gotten any worse, if anything I'm getting better.
Take care, Max