I can recommend Designer Helmets (http://designerhelmets.com) in the UK. I ordered a Caberg Justissimo from them, because the US distributor doesn't import the flat black color, and received excellent service. They also have a currency converter on their site that pops up when you click on a helmet, so you can see the price in US$.
The only potential issue, as with all helmets, is fit. It's hard (and expensive) to return or exchange a helmet between the US and Europe. That wasn't an issue for me, as I already owned another Caberg so I was certain of the size.
Philip
