I posted this on the Canada coronavirus subreddit but here might be a better place. I'm travelling to the US from Ottawa -> Toronto -> Denver, and then exactly the same on the way back. I've been fully vaccinated for 3 weeks now so can skip the quarantine but am unsure of all the different tests I have to take. Here's what I "think" I need, and where I have some questions. If someone has done this before or know someone who has or a blog about it I'd really appreciate it!

1. < 72 hours before my flight from Ottawa -> Toronto what test do I get here? I've heard the "$40" test is ok, but when I went through the Shoppers portal it was $200 (which is fine, just want to make sure I get the right one).
2. Toronto Layover - Anything to do here?
3. Arrive in Denver - Nothing
4. < 72 hours before my flight from Denver -> Toronto, get a test somewhere? What kind? Can I just walk into a walgreens?
5. Toronto Layover - Do I do anything here? Am I given a take home test?
6. Arrive in Ottawa - Can I get another rapid test from shoppers here?

Thanks!