My advice is to share your idea with people you know and see what they think. Don't waste your money on a patent. Nobody is going to 'steal' your idea. Again, I would share the idea with people you know to get a sense of interest.
Just get a better prototype made by hiring a fabricator in town. Even an indivudual with access to tools and experience in the field might be able to do it for cheap. Local fabricators will have a better idea on how to make your device for cheaper.
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