I'm in the process of getting my Canadian ATP right now. All I have left to do is take the 25 question written exam.(basically the differences between US and Canadian stuff) All you need is a Canadian 1st class medical. Take the test. poof. done.
Of course it's a PIA to travel back and forth to Canada to do this, But it can be done in one visit if you plan accordingly.
You will need to show TC all of your books. (they will want something to show instrument currency). I am using Harv's air (similar to sheppard air to study)

Medical=$190
test=$100
Harv's air study guide=$100