Satechi's Stand & Hub for Mac mini with SSD Enclosure adds M.2 drive, SD card readers, additional ports.
Satechi's $99 Mac Mini USB-C Dock Adds M.2, SD Card Reader, USB-A Ports : Read more
Satechi's $99 Mac Mini USB-C Dock Adds M.2, SD Card Reader, USB-A Ports : Read more