I've bought ASV's from several places. The best places I've found are motomummy.com and Cycle Guys.
http://www.thecycleguys.com/ I've never had any bad dealings with either company. It seems like a lot of folks deal with motomummy, so I needn't say more about Corey.
I've had good dealings with the Cycle Guys as well. There have been times when the Cycle Guys have had ASV levers that no one else had them - and have always had great prices. Besides the web site above, the Cycle guys also have an e-bay store and they advertise there that they will ship internationally. If they have a better price on e-bay than their website for levers, but they don't have the one you are looking for listed on e-bay, shoot them a message on e-bay, they'll list them and you can buy from e-bay. They're pretty easy to deal with.