supporting the PCIe 3.0 standard instead of PCIe 2.0 while also providing dual M.2 slots. The Seeed Studio PCIe 3.0 to Dual M.2 HAT [h/t CNX] costs just $45 per the official store page.
Some other SBCs like the Radxa ROCK 5C, ROCK 5C Lite, and Pine64 Quartz64 Zero also come with a PCIe FFC connector, but since the interface is limited to PCIe 2.1 x1 on these boards there’s no benefit ...