Richard's statement is correct, it costs Aerotech quite a lot of capital to have products Authorized for sale in Canada, so lack of Dark Matter or other propellants are likely a financial/marketing decision. The Canadian High Power market is only a few hundred individuals, the model side, several thousand a small fraction of the United States. California likely has several multiples more High-Power enthusiasts than all of Canada, so you see a much greater selection available to Californian Tripoli/NAR members.
Garth Illerbrun
NAR 26894 L2