Use a bunch of USB Flash drives in a RAID array. - YouTube
TERRAMASTER D5 Thunderbolt 3 Professional-Grade 5-Bay External Hard Drive Enclosure RAID 0/RAID1/RAID5/RAID10/JBOD Hard Disk RAID Storage (Diskless)
HPE P21868-B21 32GB microSD RAID 1 USB Boot Drive Server Accessories - Newegg.com
USB 3.1 Type-C to Dual M.2 B-Key SSD RAID External Drive. Support RAID 0, RAID 1, JBOD and Individual Mode
MicroSD card RAID 1 as VMware ESXi boot device
Cable Matters 10Gbps Aluminum Dual Bay 2.5 Inch External SSD Enclosure (USB C Enclosure) with USB-C and USB-A Cables Supporting RAID 1 and RAID 0 - Thunderbolt 3 Port Compatible - Walmart.com