Raspberry Pi 4 Gpio Expansion Extension Board Screw Terminal Hat For Raspberry Pi 2b/3b/3b+/zero/zero W Led Matrix Display - Demo Board Accessories - AliExpress
RPI SHD DOUBLER: Raspberry Pi Shield - GPIO port expander at reichelt elektronik
Amazon.com: T-Type GPIO Extension Module Board Adapter with 40Pin Ribbon Flat Cable for Raspberry Pi 1B+/ 2B/ 3B : Electronics
Raspberry Pi 40-pin GPIO 1 to 2 Expansion Board - Micro Connectors, Inc.