Hi Brounbbear,
What is the material you want to engrave? How many hours per week you intent to run the machine?
If you live in Singapore you should be able to get an inexpensive machine from China easy.
If you want to engrave mostly text and the readability is the main concern, probably even the cheapest machines will do the job.
Check if the fumes from lasering the card material are toxic. If that is the case think where to place the machine and how to ventilate it properly.