Even though the Superformance Canada website is still active, the company is long gone. SPFs sometimes come up on the resale market in Canada, if you're interested, so keep your eyes on the AutoTrader and other usual listings/sites.
From what I understand the BRM and FFR kits are similar, but different. You should check them both out if you're looking to build a car. The new MkIV from FFR looks pretty nice, more accurate body than the previous three editions, if that matters to you.
Also check out my
list of Cobra replica manufacturers in Canada.