Its called Cermark, expensive and it can be done with a full power 40 watt laser machine, NOT a K40. eBay lasers will have NO USA support and the Warranty is useless. Rabbit Laser USA and a couple of others sell China made machines with support. But the bad reviews are posted over at Sawmill Creek Engravers forum where we get all the "eBay laser" sob stories posted.
Unless your experienced with electronics and CNC equipment and can repair when it goes bad stay away from eBay.
The Chinese manufacture that posted here did not tell you the cost of their machine...., about 3 times your budget. Not saying its a bad machine but its expensive, yes I would like one!