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Rapid prototyping is a fairly new process that's a good alternative to more expensive injection molding. And there are plenty of companies that employ this method for you to choose from.
Rapid prototyping starts with a virtual design or animation and transforms it into cross-sections. Then each cross-section is made in physical space until the model or part is finished. Rapid prototyping does not have the same durability as injection molding, but it can definitely suit the purpose of demonstrating your new product's features and capabilities.