Bottom line, if it doesn't show up on Ebay.ca, it doesn't exist.
..Most of the Amiga stuff isn't in Canada (what the hell is?) and a whole lot of it isn't in the US. Most European Amiga sellers ship internationally in my experience, and any seller in the US who knows about the international Amiga market will as well. If you want to be a feeb and not search worldwide, bottom line, you're just going to miss out on alot of Amiga stuff that you could've gotten. Complaining about it just makes you look ridiculous. I've personally bought 3 or 4 video boards in the last year from international sellers, at decent prices.
edit: Let me at least try and be a little helpful and explain exactly how this works.
Log in to your eBay.ca
Do a search
Check the "Worldwide" option
The results you see will only be auctions that are listed as shipping worldwide or to your country.