Western Digital WD BLACK AN1500 NVMe AIC 4TB PCI-Express 3.0 x8 Internal Solid State Drive (SSD) WDS400T1X0L Internal SSDs - Newegg.com
Amazon.com: Western Digital 4TB WD Red SN700 NVMe Internal Solid State Drive SSD for NAS Devices - Gen3 PCIe, M.2 2280, Up to 3,400 MB/s - WDS400T1R0C : Electronics
HP Phison 4TB M.2 NVMe SSD PCIe Gen 4x4, HP M93208, 7600MB/s Read, 7000 MB Write | eBay