I limit my worldwide shipping to most of the places that are insurable by a third party insurer. It's all across Canada, including the rural communities and the remote northern communities where it's harder to actually go to a store and get what you might need for your kids. You turn to eBay or other online venues to satisfy those needs.
My international customers would be for the most part Europe, the U.K., and Australia. I've recently opened up to all of the countries that are serviced by Tracked Packet, because for me that tracking is important. In theory, I ship to 31 international destinations.