Many people don't know that Craigslist has a "best of" which includes this (relevant) post that makes me laugh every time I read it:
Where do you find this?!!??! This is GOLD!
https://www.craigslist.org/about/best/all
I like that the Craigslist site design is utilitarian and hasn't changed much over the years. The downside is that stuff like this can hide in plain sight.