I’d be wary with old business projectors, their blacks usually suck ass. Specifically I’d heavily prefer Epson EH-TW and Optoma Home theater projectors to Epson EB projectors. The difference in color is night and day.
The audio advice is solid though.
Make sure you don’t get scammed on a projector, always make sure to look at the native resolution, not the “supported” one. Also make sure to verify the lumens, all the listings with 10.000 lumens are using a different kind of lumens than those with 800 - 3000.
Last but not least, I wouldn’t get anything used with over 2000 lamp hours.
For those confused, it’s a space suit. I thought it was pajamas for way too long though.
Verifying yourself wasn’t what I meant, sorry that was a bit unclear. I meant make sure you don’t fall for marketing bs, and maybe try to use the same good source of info for comparison. I usually compare projector specs on https://www.projectorcentral.com/, they have specs on the vast majority of projectors out there.