I haven't sold much in awhile, but I always list CONUS only. I have made a few exceptions though.
One was to a member in New Zealand, who had other deals here that went smoothly, and I weighed the fact that he is a really good guy, and spent a lot of time in the same S/F I use to spend all my time in.
The other was a member from Russia. The particular person had been trying to find a particular custom knife, like I had for sale, for quite some time. After lengthy communication with him, and researching what was required, I decided to do it.
I was sweating bullets the entire time, waiting for it to arrive, but it all ended well, and he was extremely grateful.
The latest sale was to a member in the Marine Corp, and was stationed in Iraq. I had never sent to an F.O.B before, but after having him explain how things worked, I decided to do it. Besides, there was no way I was going to tell someone that is serving our Country, that I wasn't willing to sell to him. I figured even if something happened, and the knife didn't make it, I would refund his money. Everything went flawlessly, and after it arrived, he sent me an e-mail and told me he was so happy when it arrived, and that most people wouldn't understand how something so simple, can really bring joy into someones life, that is stationed overeas and spends their time in a war zone...
When I was driving long haul, I went into Canada quite often. It always puzzled me that when I would take a load into Canada, it was a royal pain in the butt. Having to go through customs to get the appropriate paperwork, sometimes sitting in the truck detention yard for hours, and even having to pull the truck over to the inspection station, so they could open up the trailer and look inside. Fortunately that never happened to me, but I saw it happen to others quite a few times...
When I would reload in Canada and head back to the states, I would pull up to the window, hand them my paperwork so they could look at it and stamp it, then roll on through. There is no reason trading between the two countries needs to be as difficult as it is.
For most of us here, selling and trading knives is just a hobby. If you send something, and there is good potential that it will get hung up in customs, and you sit and wait, hoping it will go through and be delivered, it's just not worth the headache, because it takes the fun out of it.
I know that's not the fault of the citizens of Canada, and not really fair that they are excluded from transactions, but from the sellers standpoint, it is just not worth it...