We use Spreadshirt to run the shop... they have two sites, one that does Europe and one that does the US. The European shop doesn't deliver to the US, so we set up a US shop too. The US shop DOES now deliver to Europe (and many other places) though...
So if you want something in the European shop and you're in the States you'll need a friend in Europe (or Japan strangely) to buy it for you. But people in Europe (and Japan, Korea, Mexico, Canada, Australia etc) can buy from the US shop... I think.
The reason for different products is that the two sites have different stock to chose from.
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