I have some of these mini PCs at home. Not just HP but Lenovo and Dell are also making them. A Dell Optiplex 3080 with i5-10500T, 16GB DDR4, and 256GB NVMe SSD

I have some of these mini PCs at home. Not just HP but Lenovo and Dell are also making them. A Dell Optiplex 3080 with i5-10500T, 16GB DDR4, and 256GB NVMe SSD is ~200€ and can be upgraded to 64GB RAM with a lot of storage (NVMe + a 2,5")