So I got a Samsung 860 EVO 500gb SSD for $69.99 during a flash holiday sale. However, I did a little bit of research on NVME PCI 3.0x4 M.2 SSDs. I have a Asrock z170 Pro4s with a M.2 slot and it looks like there are a few NVME PCI3.0x4 M.2 SDDs from reputable companies around $79.99:
Crucial P1...