I have used model engineers laser and he did a great job, very neat which can be an issue with some places. He is very quick and quite well priced BUT it takes far longer and costs a lot more to turn your own design into a product! You could send a copy of what you want off to him and perhaps a few other places, there are plenty of laser cuters about just look on the net or the yellow pages, not all do brass though!
Don't forget that the price becomes massivly reduced the more you order! Last time I had some big steel stuff done it was less than half price if you had over three of them!
Cheers
Rob