How about sandcarving instead? You can get into it A LOT CHEAPER and get much better results. If you use photo-resist you would be amazed at the detail you can get. Best of all, it won't cost anywhere near what a suitable laser would run you. A cheap, Chinese laser (cheap=chinese) is just not what you would want, especially if you want true "plug-and-play" and no messing around to get it working.
Sandcarving would entail getting a small cabinet ~$200 at Harbor Freight, either a pressure pot ~$100 at HF or a pencil blaster ~$100 also but really perfect for glass, a compressor ~$500 for a decent one that can keep up with sandcarving, dust collector ~$100 at HF, 180 grit aluminum oxide ~$1.00 per pound (don't use sand or glass beads, they won't work). You'll not want to do this inside your office unless you want a fine coating of dust everywhere, but it's not as messy as you might think. For the photo-resist you need 3M transparency paper, a laser printer and an a means to expose the resist.
All told, you can get all of this for $2,000-$3,000 - way less than a laser.
I love my laser but the results I get from sandcarving is MUCH better!