You could set a session variable with the country and set up a shipping rule so that it didn't charge the international rate unless that variable was set and did not equal "US"
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.