These folks:
http://www.aixiz.com/Have everything you need. Plus you get to travel back in time to a mid 90's website.
Get the module, lens and holder. We like the straight line pattern. The crosshairs don't
work out like you would think unless you can place laser directly above substrate with no angle.
We use the "Module Rack" holders for easy positioning and install a magnet on the bottom to move
it around if need be (S-Types). That blue flexible stuff with orange fittings someone linked to would
work as well.
A quality regulated power supply is most important. In the past we used a wallwart and laser life was pretty short.
We have 4 lasers per press at probably $60 each machine.
(Doesn't touch the Roq setup though)