Making a prototype for simple accessories like sunglasses or wallets costs anywhere from a few hundred dollars to several thousand, depending mostly on size and how many you make. Fewer than 20 parts keeps it simpler.
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The short answer is it's a really wide window of costs. Some examples for you would be relatively simple, no electronics. We're talking about something like sunglasses, wallets, accessory-type products, simple products that don't have any electronics in it, and they have a part count of under, let's say, about 20 pieces. There's no more than 20 individual parts that have to be made and assembled in order to create it. With those kind of prototypes, we see in a range from a couple hundred dollars, mostly off-the-shelf parts, even some 3D-printed parts, relatively cheap depending on the scale, all the way up to several thousand dollars. It just depends on the quantity and size. Size is actually a huge part of cost.