OWC 1.0TB Aura Pro III PCIe 3.0 NVMe M.2 2242 SSD at MacSales.com
PCIe 3.0 to (2) U.2 SFF-8639 Adapter, X8, for 2.5 U.2 NVMe SSD or 2.5" SATA SSD - Newegg.com
7.68TB 3D TLC PCIe 3.0 x4 NVMe U.2 SSD for – Water Panther
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Amazon.com: A ADWITS PCI Express 3.0 x16 to PCIe-Based NVMe and AHCI SSD Adapter Card with Heat Sink, Fits M.2 (NGFF) Form Factor with Key M in Size 2230/2242/2260/2280 : Electronics