Amazon.com: M.2 NVME to PCIe X8 Expansion Card, NVME PCIe SSD to PCIe X8 Adapter Card, Support M Key, for M2 NGFF NVME Hard Drive,PCI E Card Converter Adapter Card (ph45) :
HPE Solid State Drives - HPE 1.6TB NVMe x8 Lanes Mixed Use HHHL Solid State Drive Card P10264-B21
MAIWO M.2 expansion card KT058A NVMe SSD to PCIe 3.0 X16/X8/X4 adapter M Key Converter Card Support 2230 2242 2260 2280,Compatible with Windows 7/8/10 & Linux ,BTC accessories - Newegg.com
Quad Slot M.2 NVMe PCIe 3.0 X8 Adapter Card with ASM 2824 PCIe Bifurcation Function, Work with None PCIe Splitter Function Motherboard