Any Photo Etching Services Out There?

I've looked a couple of times on the web for any etching services, kind of like Shapeways, where you supply the artwork and they'll etch your parts in brass or steel. So far I'm not having much luck. Wondering if anyone knows of a service like this available in the US? I'd do it myself but 1) I want a quality result (this would be for an N-Scale project initially) - and 2) I might want to do a batch which I don't have the resources to do in quantity.

So - anybody have affordable suggestions?

Thanks -Mike

 

Thanks, Paul - I'll check them out! -Mike