64x32 RGB LED Matrix With Arduino Mega : 6 Steps - Instructables
Amazon.com: Adafruit Medium 32x32 RGB LED matrix panel : Industrial & Scientific
Flexible Pixel RGB LED Matrix Display Panel
Amazon.com: 2PCS LED Matrix Panel High-Definition Indoor Led Display Digital LED Module LED Display Screen P2.5 64x64 RGB SMD3 in 1 Plain Color Inside(6.29" x 6.29" x 0.5") : Electronics
LEDuino Flexible RGB Matrix LED Panel for DIY Signs and Patterns – SainSmart.com
64x32 RGB LED Matrix - 5mm pitch : ID 2277 : $49.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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$29.30 - Full Color RGB LED Matrix Panel - 16x32 - Tinkersphere