You know, replica Surefire lights are available as well for quite cheap and perform well. I have the G&P version on my KSC G17. I've used it for indoor games in the dark and it performs flawlessly, and at a considerable discount from the cost of the real thing. It cost be about $70 I believe.
But if you insist on the real deal, you can import them. There's no law preventing the importation of weapon lights.
EDIT: Right here in Canada. A King Arms replica. Nice and cheap too.
http://www.airsoftparts.ca/store2/in...roducts_id=323
No laser on this though. Just the light.