I've bought and sold many items north of the border. And not had any problems. The key is this: I've always prepaid when I was purchasing something, and had them prepay me when they were purchasing from me. Some will argue this takes any control out of one party's hands, but I think a certain level of trust is already a necessity. I probably wouldn't do this with a high ticket item like an amp or something like that, but for cables etc. . . it's worked perfectly for me. Also, I think when a lot of folks mark 'usa only', they'd probably sell to Canada if you ask them to. Many don't think of Canada as 'foreign' territory.
Ship to USA only?
I'm new to the site and have yet not made any transactions. I've noticed that most sellers on the classifieds are only willing to ship within the US. I live in Toronto, Canada and I'm simply wondering if there are reasons most sellers are not willing to sell across the border. Are there problems with Canadian customs?