https://eu.registerguard.com/story/business/2018/11/11/in-ch...

> Gates acknowledged that some reinvented toilets, in small volumes, could cost as much as $10,000, but added, “That will pretty quickly come down.”

I added an extra zero, sorry, I read it 8 years ago. But still doesn't really matter, even the optimistic 500 USD is laughable.