USB Mini Hub with Power Switch - OTG Micro-USB : ID 2991 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
USB 2.0 Host-to-Host Cable -- DataPro
FYSETC USB Host Adapter 3421 V1.1 for Malin 2.0 3D printer mainboard E – FYSETC OFFICIAL WEBSITE
USB HOST MIDI 2 USB HOST MIDI -UHM [UHM2] - €75.00 : Zen Cart!, The Art of E-commerce
CH559 USB Host to UART Bridge Module from MatzElectronics on Tindie
keyestudio USB Host v1.5 shield compatible with Google Android ADK support UNO MEGA for arduino
Amazon.com: USB Host Shield Compatible for Arduino MEGA 2560 1280 Support Google Android ADK & USB HUB Function : Electronics
Amazon.com: DSYJ DSYJ-D0000101 Micro USB Host OTG Cable with Micro USB Power for Nexus 4 Nexus 7 Galaxy S Iii & Galaxy Nexus 0.65ft 1Pcs Black : Cell Phones & Accessories
Kenton Midi USB Host – Thomann United States
Intelix AVO-USB-H Host Side USB Extender AVO-USB-H B&H Photo
Kenton MIDI USB Host MkII (for Class Compliant MIDI devices) - Control Voltage
Amazon.com: ARCELI USB Host Shield for Arduino UNO MEGA 2560 Support Google Android ADK USB HUB : Electronics
5in Micro USB to USB OTG Host Adapter - USB Adapters (USB 2.0) | StarTech.com
Tebru USB Host Shield for Arduino UNO, USB Host Shield for Android ADK,USB Host Shield for Google Android ADK & UNO MEGA Duemilanove 2560 Arduino - Walmart.com
CH559 USB Host Breakout Board from MatzElectronics on Tindie