While not the cheapest option (supermarket-grade borescopes can be found for $40), the —expect CMOS sensors from Sony or OmniVision, not generic sensors. The longevity and accuracy justify the premium for professionals.
Also, I noticed that coccovision.com seems to be a website that sells CO2 laser engraving machines and related products. If that's correct, here is a general article I came up with: coccovision.com