Sintech PCI-E Express X1/UB to M.2 A/E Key Adapter Card with FPC Cable
Amazon.com: GLOTRENDS M.2 PCIe X1 Adapter with M.2 Screw for M.2 PCIe 4.0/3.0 SSD (NVMe/AHCI Key M), PCIe X1/X4/X8/X16 Lane Installation, but Only PCIe X1 Bandwidth (PA09-X1) : Electronics
Amazon.com: 2 Port M.2 SSD to PCI-e x1 adapter B or B+M key (SI-PEX40115) : Everything Else
Amazon.com: MZHOU NVME M.2 SSD M Key to PCI-e 3.0 x1 Host Controller Expansion Card Supports M.2 NGFF PCI-e 3.0, 2.0 or 1.0 NVME or AHCI, M-Key, 2280, 2260, 2242, 2230 Solid