Amazon.com: M.2 NVMe PCIe Adapter,Dual M2 SATA B Key and NVMe M Key SSD to PCI-e x4 Adapter Card for 2280 2260 2242 2230 SSD, with M.2 Heatsink (M.2 NVME Mkey Card) :
RCKPI4 M.2 - use PCIe Sata card (up to 8+ ports)? - Hardware and peripherals - Radxa Forum
Vantec M.2 NVMe PCIe x4 Low Profile Adapter with 110 Length Support - Micro Center