I think that Value Added Tax might be a "Canada thing", wouldn't have to worry about it in the US, eh. Unless you just mean the prices out of the UK.
I don't believe they were trying to add VAT to my order. It may have been the exchange rate making a difference as well, between GBP and Euro. That of course should be compared before purchasing.
The place I linked to does ship to the US.
It was the best deal I could come up with, and a common thread between the UK suppliers and the German suppliers, was the German suppliers were always less (and I was adding the shipping cost to get a fair comparison).
I was keeping records of the helmet price with shipping (from the place in Germany), the lowest I saw was $543.97 in early Sept '09, high was $553.55 in early Oct '09. I saw where the prices were headed and I just thought "man, it's going to be a long time before the exchange rate is in my favor".