Hi Michael,
Here are a couple of links that I have saved along the way for laser optics.
However, I have not purchased from any of them.
Hopefully they can be of some assistance for you.
http://www.designresearchoptics.com <-- This company was used for a home built CO2 laser I came across.
http://www.laserresearch.net/index.asp http://www.laserresearch.net/shoppin...cts.asp?id=280 <-- Beam Combiners
http://www.lightmachinery.com/
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Best Regards,
Andy