SanDisk's dual metal 128GB Flash Drive for USB-C gear and iPhone/iPad now $37 (Amazon low) - 9to5Toys
SanDisk 256GB iXpand Flash Drive Go for iPhone and iPad - SDIX60N-256G-GN6NE & Case Logic JDS-2 USB Drive Shuttle 2-Capacity (Black/Blue) : Electronics
MFi Certified 128GB Photo-Stick-for-iPhone-Storage iPhone-Memory iPhone USB for Photos iPhone USB Flash Drive Memory for iPad External iPhone Storage iPhone Thumb Drive for iPad Photo Stick : Everything Else