How much would I expect to pay for a cheap but reliable second hand car?
That’s going to depend on what you class as reliable, how much you want to look, and how much you know about cars. Typically, it will be fairly easy to find a reliable used car for between CAD 3500 and CAD 6500 (plus 15% tax). If you know enough about cars to recognize what to look for, and are willing to spend a little time looking around, you can find reliable cars for less than that, too.