Amazon.com: LINKUP - NVMe Enclosure M.2 SSD to USB C 10Gbps Adapter | Aluminum Case USB 3.1 Gen 2 (10 Gbps) to PCIe Gen3 x2 Bridge Chip | for Windows & Mac
WESTERN DIGITAL SDAPTUW-256G-1012 NVMe PCIe Gen3 x2 256GB NGP80 0NGP80 | eBay
Amazon.com: KingSpec 512GB M.2 NVMe SSD, 2242 PCIe Gen3x2 Internal Solid State Drive for Laptop/Notebook (2242, 512GB) : Electronics
I harvested a PCIe Gen3 x2 NVMe 1.3 SSD from my older laptop, the problem is that its length is short. I've held it in place with some tape, it should hold.