They provide you with a form to check if your address is supported which is linked to one system that do the check. I think it is possible to link the two syste

They provide you with a form to check if your address is supported which is linked to one system that do the check. I think it is possible to link the two systems together to give you the price for your particular address. I don't think taxes and fees here has to do with anything other than your physical address (They are not the IRS after all)