The problem with buying locally is that most local product is "tank raised" or "net pen raised" and as such have a much lower success rate than if you buy true captive bred seahorses.
There is a lot of misinformation about seahorse keeping but I have links to a lot of excellent information listed at the bottom of
"MY THOUGHTS ON SEAHORSE KEEPING" page.
True captive bred are hard to find in Canada.
Seahorse Sanctuary has now stopped selling seahorses so that wiped out a lot of species right there that were coming into Canada.
However, Blue World Aquatics has been bringing in true captive bred reidis from Aquamarine International, and is waiting on paperwork to bring in true captive bred erectus and dwarfs from Seahorse Corral.