I have this one
http://www.astrosystems.biz/laser.htm I think I paid about $170au inc shipping from the states.
I'm no expert on the subject but it seems to the job pretty well. I also have an orion collimating eyepiece that I use to fine tune my set up. I have a 12" Light Bridge so being able to quickley collimate is a must and a laser is the quickest way that I've found to do, but it only gets you part way there.
Id did a bit of research on the subject a while back apparently these are about the best money can buy
http://www.catseyecollimation.com/ but the price was just a bit much for me and I'm happy with my purchase.
Happy hunting.