Low-Profile M.2 NVMe SSD to PCIe 4.0 Adapter with Heat Sink for 1U - Micro Connectors, Inc.
Amazon.com: REDLUX PCIe 3.0 to NVMe (1) M.2 Adapter for M.2 (M Key) SSD, X4,Compatible with PCIe 3.0 Motherboards and Backward Compatible with PCIe 2.0 and PCIe 1.0 : Electronics
M.2 NVME SSD to PCIe PCI Express 3.0 x4 Convert Adapter Card M Key with Heatsink | eBay
OWC 1.0TB Accelsior 1M2 NVMe PCIe SSD at MacSales.com