Amazon.com : Led Matrix 64x32 Pixel 4MM Led Panels Digital Module Indoor Flexible for Special Shapes Display Screen RGB led Board Hub-75 2121SMD (P4-256x128mm, RGB-Full Color) : Office Products
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64x32 RGB LED Matrix - 3mm pitch : ID 2279 : $44.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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rgb led - Need help in connecting 64x32 LED Matrix - Arduino Stack Exchange