I've found that monitors are a good item to buy used, because they're usually a lot cheaper and 100% as functional...and I like to get used electronics when I can, for environmental/climate reasons.
I bought a 27" LG 4k monitor for $200 on Craigslist, which would have been ~$500 new, and I love it.
I just recently got a Dell S3220DGF. 32", 1440p, 165hz and hdr10.