If you're making a bunch of boards, then I'm sure there's a site out there that will do it, but if you're just making 1 or 2, I doubt it would be cost effective. Setup and etching multi-layer boards is not cheap, by any stretch.
Plus quality control on multi-layer boards has to be top notch as I've seen some boards that were 7 layers have a short between two and actually get hot enough to melt the substrate.
I had seen a site a while ago that would do some etching, I'll see if I can dig it up again. I may be etching some boards myself soon after I finalize some circuitry I'm designing for my latest mod project.




