A suggestion for the site:

As a Canadian trading 99% of the time within the country, I wonder if it'd be possible to allow a restriction on the "Interesting Cards for Trade" section on my homepage to only show activity within my country. Most of it ends up being U.S. traders willing to trade within Canada, but it'd be great to have a filter to allow me to take a look at relevant activity within Canada only.

I second this. Sometimes shipping costs make trading with users from different country unfeasible, and for such cases it would be convenient to have an option to check only trades from your country.

Yep, homepage / dashboard cleanup coming next month, with more options!