I think it was reddit? Searching for it is not helpful though as it appears it’s not all that rare of a deal, the coffee subreddit has like a dozen posts of people asking about “is a used bunn for $150-200 off marketplace a good deal”

And man browsing this is why I fucking hate reddit. There’s always some pedantic asshole to be like welllllll maybe butttttttttttttt here’s the problem with that deal: it’s not a $6000 grinder that looks like a prop from a Wes Anderson movie. Like the answer to that question is “yes”, or maybe “yes but you’ll have to clean it real good because it was in a grocery store for 6 years and never got cleaned once”