I'm already ordering so much stuff from Amazon every week, that it's natural to look there first, and more often than not, I get it there.
I've used places like this in the past for obsolete stuff, but I usually find it when I need it just with a few Google taps for the product for which I'm looking.
https://www.breakerking.com/ (No endorsement as it was too long ago to remember which of these types of companies I used)
I didn't notice this was in the Canadian forum (I only use the "New Posts" button), so I have no idea what restrictions you have on ordering stuff online from US retailers.