Shipping to international locations is not a problem for us. Our shopping cart, and in fact all of our web site, has been developed in house. We have not found a good way to integrate international shipping into our cart so we revert to "old school" techniques and handle everything manually. Here is what happens:
All this seems to work very efficiently. The Postal Service is our "go to" carrier, especially for smaller orders. In many countries this eliminates the need for a customs broker (although duty may be owed at the time of delivery).