Kingston at CES 2018: A 6.4 TB U.2 Enterprise SSD with Four M.2 Behind a PEX Chip
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U.2 SFF-8639 To PCI-E X4 Expansion Card High Speed SFF 8639 To PCIE 3.0 X4 Riser Card for 2.5inch U.2 NVME SSD for SATA 7 15 SSD - AliExpress
OWC 8.0TB U2 Shuttle 3.5-inch NVMe U.2 SSD at MacSales.com
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4.0 Full Speed M.2 NVME TO U.2 SFF8639 Extension Cable U2 To M2 M KEY NVME SSD Motherboard interface PCI-E4.0 Adapter Converter(R47UL 4.0)(60CM) - Newegg.com
GLOTRENDS U.2 (SFF-8639) PCIe NVMe 4.0/3.0 Adapter for U.2 PCIe SSD, PCI-E GEN4 Full Speed, Desktop PC Installation - Newegg.com
Cryo-PC Full Speed NVMe SSD PCIE PCI-Express 3.0 X16 to U.2 Adapter Converter Card Module New - NWCA Inc.
StarTech.com U.2 to PCIe Adapter for 2.5" U.2 NVMe SSD - SFF-8639 PCIe Adapter - x4 PCI Express 4.0 - NVMe PCIe Adapter - U.2 PCIe Card - Mount a 2.5" U.2