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
Understanding M.2, the interface that will speed up your next SSD | Ars Technica
ST PEX4M2E1: x4 PCI Express to M.2 PCIe SSD adapters at reichelt elektronik
KingSpec M.2 NVMe PCIe 3.0 x4 SSD with DRAM Internal Solid State Drive SSD with Cache Speed up to 3500MB/s High Performance for Laptop Desktop Gaming SSD - Newegg.com