Zexstar - LED Universe Nichia LED Matrix mini 126 (9x14) 504 LEDs (8568lm) 4000K white
P3.75 dot matrix led module,3.75mm high clear,top1 for text display,304* 76mm,64 * 16 pixel, red monochrom dot matrix panel|dot matrix led module|matrix led moduldot matrix panel - AliExpress
In-Depth: Interfacing MAX7219 LED Dot Matrix Display with Arduino
64x32 RGB LED Matrix - 6mm pitch : ID 2276 : $64.95 : Adafruit Industries, Unique & fun DIY electronics and kits