Here's one company that does it:
Central Indiana Pattern and Mold (CIPM, Inc.) does prototypes. They can make anything from many different materials, including wood, plastics, urethanes, metals, fiberglass. They have been in business beginning with the owner's father, since 1974, and have since acquired computerized methods and machines in addition to the traditional ways. They welcome new business and new customers.
To the left are some more links that may help (hatchone, cosmeticindex, pardev, t2inventions, utleys).
If you wanna make the prototype in China, there is a reputable company name Vulcan Industry Co.,Limited who can also do the prototype with good quality
