Not sure what sort of volumes you are after, if you are after a one off, this guy can make you a case to order:Originally Posted by RobinMasters
http://www.watchcaseworks.co.uk/
I have used him for some repairs on cases and he is good.
If you are after several it might be worth getting in touch with these guys:
http://www.ickler.de/English/watch-case-home.htm
I guess that most 'cheap' cases are made in china these days, like most things... :(