You're literally typing your postcode into the search box.

Had no idea what a Canadian postcode looked like, now I do.

If you tell someone your location over Tor, Tor can't help you.

Okay, I finally managed to find an Exit that wallmart.ca didn't block.

That post code is just the default. Purely co-incidence if it happens to match where you are actually located.

The website has no idea of your real location.

It seems your exit happens to co-incide with the country that you live in?

It's not your location data, if anything it's the location of the exit (according to MaxMind).

You're literally typing your postcode into the search box.

Had no idea what a Canadian postcode looked like, now I do.

If you tell someone your location over Tor, Tor can't help you.