Just to engrave cut paper cloth and leather etc I use a 2.8w unit from aliexpress but would be slow in CNC router, I just knocked up a 2 axis nema17 driven unit with Ramps 1.4 and Arduino Mega 2560 including bearings etc under £200 runs Repetier firmware and software code produced straight out of inkscape. The laser comes with TTL driver 0-5v control same seller I got mine from good enough to engrave and simple to wire use 0-5v supply same as spindle 0-10v setup.
mine http://www.aliexpress.com/item/REAL-...00009.1.33k3rt