If is quite easy to use a freight forwarding service to have the product shipped to a local address (in the UK) who will then forward on to you. For example I have used Forward2Me.com to buy lots of stuff in the UK from suppliers who will not ship to the US. The price is reasonable and there isn't any ongoing membership charge. They will even act as your buyer if the vendor will not accept a US credit card. They have shipping addresses in Germany and throughout Europe as well. If you don't like them they have many competitors.
When my Heki dome cracked, a new one from Dometic cost almost twice what I was able to buy the whole unit for from the UK.