The OCZ RevoDrive Hybrid, a PCIe SSD with a HDD piggybacking a ride - PC Perspective
x4 PCI Express to M.2 PCIe SSD Adapter - Drive Adapters and Drive Converters
M.2 PCIe/SATA SSD extension module — Disk Drive Solutions
What is a PCIe SSD?
Price history & Review on Kingspec M.2 PCIe SSD Disk 128GB 256GB 512GB SSD hard Drive M.2 NVMe Pcie SSD Internal Hard Disk For MSI Notebook/Thinkpad P50 | AliExpress Seller - Highway