Basically it is easy to learn to be a security guard in Ontario, Canada, and doesn’t take a LOT of study, so buy the cheapest and make sure it’s online. Private investigator studies are a bit more difficult. But still, buy it on the cheap, maybe in a package deal.
The cheapest I have found is: The Academy of Investigative Studies Located in Toronto, but teaches exclusively online.
At the time of writing this, CA89+HST. Get both in a package for CAD220+HST.