Talk to Ehgemus. He can custom machine one for you, and he can even powder coat it black. I think he could do it for less than $100.
It would not have a aperture shutter, and you may have to ask if you want a lock switch in the rear though..
here ya go! No need to thank me...
Broken DPSS CNI Green 532nM Laser 18650 IR C-mount Host - eBay (item 270602273285 end time Jul-08-10 07:06:21 PDT)
Yikes! Good find! Hopefully you can't go too wrong with just a host... we may have watch for pad bidding...