Apple is now selling the 2018 Mac Mini desktop in its refurbished store. Prices start at US $599 for a Mini with a quad-core Core i3 CPU, 8 GB of DDR4 RAM, and a 128 GB PCIe SSD. While this might be more expensive than an equivalent Windows desktop, the value compared to other macOS computers may be enticing for some.
https://www.notebookcheck.net/2018-Mac-Mini-pops-up-in-Apple-s-refrubished-store.460897.0.html
Apple has been selling the 2018 Mac Mini refurbished ever since 2018 or at least early 2019. I was going to buy one back then. At least two models were available one of them being the entry model.