Search all classified websites with one search engine

I’m searching for many excessively rare speakers, amplifiers and equipment in Canada, North America.

im looking for a website in which I can search across all classified platforms in Canada with one search.  
Yes HIFI Shark searches across many platforms although there are many platforms in which it doesn’t cover..

do you know of a search engine that searches many classified websites across Canada, or America? 
Contact HFS and ask them to include the sites you alluded to.
Maybe you can start with
Of course, they do cover eBay, and others. Try to use their "Instant Alert" for saved searches. Very handy.