Another approach for this if you're in europe (I do not know the market elsewhere) are the quality refurbished resellers (they buy bulk from companies upgrading, refurbish, sell with warranty).
Price might be a bit higher, but eg right now for sub 200 you can get a mini pc with ryzen 2400G and 16GB of RAM, with warranty. That's a great proxmox machine for jellyfin & co.
Eg in France https://www.afbshop.fr/PC-Bureau or https://www.tradediscount.com/ordinateur-bureau/unite-centra...
Price might be a bit higher, but eg right now for sub 200 you can get a mini pc with ryzen 2400G and 16GB of RAM, with warranty. That's a great proxmox machine for jellyfin & co.