I just spent a little while updating the DOW store. We now have a few new possibilities, and things are generally streamlined a bit better:
Square now accepts international orders. I have therefore ditched Paypal.
Square allows me to change the shipping rate on various regions. I have used this to block EU orders, which we cannot accept due to the 2015 VAT tax law. I have also set a flat $25 international shipping rate, for non-EU countries.