$29.30 - Full Color RGB LED Matrix Panel - 16x32 - Tinkersphere
LUMEX - LDM-6432-P3-UR-1 - LED DOT Matrix Display, 64 X 32, RGB, 5V: Amazon.com: Industrial & Scientific
16x16 NeoPixel WS2812B Digital Flexible LED Panel (Matrix)
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
Arduino Based RGB Matrix LED Tester : 12 Steps - Instructables
Led Display Module Panel 8x8 8x32 16x16 Rgb Dot Matrix Light - Led Modules - AliExpress
32x32 RGB LED Matrix Panel - 4mm Pitch : ID 607 : $29.95 : Adafruit Industries, Unique & fun DIY electronics and kits