Overview | 32x16 and 32x32 RGB LED Matrix | Adafruit Learning System
64x32 RGB LED Matrix - 6mm pitch : ID 2276 : $64.95 : 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
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Full Color RGB LED Matrix Driver Shield + RGB Matrix Screen - Wiki
32x32 RGB LED Matrix Panel - 5mm pitch
Grove - RGB LED Matrix w/Driver | Seeed Studio Wiki