Amazon.com: waveshare USB 2.0 HUB 4 Port, Onboard Industrial Grade HUB Chip, up to 480Mbps Data Rate, with ESD Protection and Multiple Protection Circuits, Multiple OS Support, Plug & Play : Electronics
4 Port USB HUB HAT for Raspberry Pi, USB to UART Onboard
Vention High Speed 4-Port USB 2.0 Nickel Plated Hub With Power Supply – JG Superstore
Zero4U - 4-Port USB Hub without Pogo Pins [v1.3] : ID 4115 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
USB Hubs | Microchip Technology
USB Hubs | Microchip Technology
FE1.1S USB 2.0 High Speed 4-Port Hub Controller | Terminus USA | Fabless IC Design House