kayak.com for 3d printing services
The site was up for several years and, at one time, included localized versions for both German and Korean visitors. I took it offline in 2020 when the hype around 3D printing had long abated, many of the services covered had disappeared, and the others had become a lot more transparent about their pricing. Maybe this project played a small role in causing that latter part.
One day I will write a more complete history of this project, until then I'll fill this space with an absurdly long screenshot of a results page taken from 3dprintingpricecheck.com.