I recommend anyone who is thinking about developing a product to watch this 9 minute video.
https://www.bloomberg.com/news/videos/2019-01-10/inside-the-future-factory-video
The entrepreneur he talks with at the end of the video raised some money with kick starter and then went to Shenzhen to develop / make it. Also of note is the HUGE component market.
Best Regards,
Dreamryder007