The complete idiots guide to Chinese "K40" Laser Cutters for ...
Laser Cutter-SUNCOO K40 Laser Engraver DIY Engraving Machine for Wood, Glass, Acrylic 40W CO2 with Air Exhaust Fan USB Port Only for Windows System 12×8 Inch (Blue) – this one looks to be good, but it does have a 1″ focal length rather than a more common 2″, so it’s going to be out of focus straight out of the box.