I don't personally know of anyone in this area of business, but China is the obvious place to source something like that. That said, the best advice I can give you is to do this type of business in person, if not possible, then get yourself a very good source management agency to do business on your behalf.
Chin has a reputation of manufacturing cheap and nasty products, but it's a really unfair reputation. You can get anything made there to any standard you require, but this is where good communication is required!
You want cheap, they will do cheap, you want top quality, they can give you top quality. The reason China has the type of poor quality reputation it does with some people is down to companies saving as much as they can and having the build quality scaled down to make those savings!