64x32 RGB LED Matrix - 5mm pitch : ID 2277 : $49.95 : Adafruit Industries, Unique & fun DIY electronics and kits
64x32 RGB LED Matrix - 3mm pitch : ID 2279 : $44.95 : Adafruit Industries, Unique & fun DIY electronics and kits
32x16 RGB LED matrix display with Arduino UNO microcontroller | DFrobot - YouTube
Adafruit RGB Matrix HAT + RTC for Raspberry Pi - Mini Kit : ID 2345 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: RGB Full Color LED Matrix Panel 64x64 Pixels, 4096 Individual RGB LEDs,Adjustable Brightness,3mm Pitch, Displaying Text Colorful Image Animation Chainable Design Compatible with Arduino/Raspberry Pi : Electronics