The ROCK 3A is another single-board computer by Radxa, which has released the Zero, an upgraded Pi 4 Plus and the Pi X in the last year alone. The ROCK 3A features a Rockchip RK3568 SoC, up to 8 GB of RAM, and dual M.2 slots for adding an NVMe SSD and a Wi-Fi module. The Radxa ROCK 3A is relatively cheap, too.
https://www.notebookcheck.net/Radxa-ROCK-3A-New-Raspberry-Pi-sized-single-board-computer-arrives-with-two-M-2-slots-at-an-affordable-price.551857.0.html