There aren't that many around because of the cost, a very small market. I bought my HBRTG and rays from a LFS in Winnipeg, Manitoba but I don't think there are too many others locally for me. You can try the arowanacanada forum as they may still do one last group buy. There are also the occaisional postings by owners selling them.
You are dead wrong my friend. Toronto has a lot of asians in their population, hence why you found some Asian Arowanas in an LFS. Most other cities in Canada, Montreal per example, that have a Chinatown don't have any LFS that sell Asian Arowanas. Not every Canadian hobbyist can afford an Asian Arowana.
To the OP, if you live in Ontario, it should be fairly easy to find Asian Aros, and also at a very decent price.