M Key M.2 PCIe NGFF SSD to PCI-e Express 3.0 x4 Adapter Card Controller with Heatsink for 2230 2242 2260 2280 mm M Key M.2 PCIe Based AHCI NVMe SSD - Newegg.com
StarTech U.2 (SFF-8643) to M.2 PCI Express 3.0 x4 Host Adapter Card for 2.5†U.2 NVMe SSD - Walmart.com
Whats the difference between PCIe 3.0 x4 and PCIe 3.0 x2? - Quora
High Speed 32Gbps M2 PCI-E NVMe SSD to PCIe 3.0 X4/X8/X16 Adapter Card Converter | eBay