If you don't have one, or your PC is a bit older, you can still find a great deal on a SATA SSD. These are slower than NVMe drives but they're still a huge improvement on a traditional hard drive.

This competitively priced 1U rack NAS presents four hot-swap LFF/SFF SATA drive bays at the front, secretes a pair of NVMe SSD slots inside and teams them up with four 2.5GbE multi-gigabit ports.