12 cores and 24 threads for just under $400.
AMD Ryzen 9 3900X 3.8GHz 12 Core AM4 Boxed - Micro Center

Anybody looking to upgrade, now is a great chance to save $100 on a fantastic CPU. Of course, you would have to live close to a Microcenter to pick it up, as it's in store only. I'm only about 45 minutes away from the one in Michigan.