I was thinking in the rules for the Buy/Sell/Trade and Hot Deals area could you add that in the tread title you have to add your country to the title, I only ask because I don't like wasting other peoples and my own time but looking at something and finding they live in the USA or Cannada.
I mean something like this example of a tread title.
19in LCD Dell for sale [England]
19in LCD Dell for sale [USA]
19in LCD Dell for sale [Canada]
Get what I mean?