bargainhardware.co.uk is my usual source; even though I now pay import taxes, it's still often the cheapest option. (±€30/disk on my last order)

• Supermicro H11SSL-N6 with an Epyc 7551P with 128G memory - €600
• PSU - €60ish
• Pile of refurb 4TiB disks - €100
• Mikrotik hAP ax² - €80
• HP Procurve 2848 - €40
• Misc gubbins - €180

There's a server, networking gear, and storage. I can sort the rest out later.