Put it at the end of the product for sale or trade in brackets, so it's easier to pick up. Example:WTS Glock 17 (MA). Require that the exact location is listed with members name. Just my 2-cents.
I could put it in brackets but I can't put it at the end of the listing title.
I agree with the exact location in the profile but it is something that would have to be manually enforced by myself and moderators, which is more work than I am willing to do.