Here's where you can buy a bunch of junk for cheap:

8x8 LED Matrix (various colors) - 9 pack $10

These LED displays are the "Water/glass" lens variety which means that there is no diffuser over the LED itself.  They're available in three colors.  Datasheet and images below:

HS-1583BX

Orange

Amber

Red

8x8 White LED Matrix - 3 pack $10

These are the same LED matrices you see here, but cheaper!