Reddit reviews 8 Pcs DM Micro USB 2.0 OTG and Type-C to USB 2.0 OTG Adapters, AFUNTA 4 pcs Micro USB to USB 2.0 connectors and 4 pcs USB-C to USB 2.0 Converters for Smartphone Tablet USB Cable Flash Disk - Black
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COMPATIBILITY: This ultra mini DM OTG adapters are suitable for cell Phone, tablet, USB Cable and flash disk use.FUNCTIONS: Connect your USB On-the-Go capable tablet computer or Smartphone to USB 2.0 devices (thumb drives / USB mouse / keyboard, etc.)STRONGER AND FASTER: They supports all OTG and U disk, the stability is stronger and faster, easy to achieve expansion and two-way data transmission.8 PACKS OF ADAPTERS: The package includes 4 pcs of mini DM Type-C 4pin OTG adapters and 4 pcs of mini DM Micro USB 5pin OTG connectors.PLEASE NOTE: This adapter will only work with devices that support USB OTG functionality.
Mini USB 2.0 Micro USB OTG on ebay, or amazon has them too