as for the LCDs, all came from mouser but Ii think digikey has most of them as well. the rgb backlight is JUST a tricolor 4 wire led stuck in sideways in a diffuser. for that its $4 more 
I can't find rgb backlit 20x4 displays - only 16x2. the music player app really screams out for a larger display so I'd like to get a 4x20 one and I'd like it to have the rgb backlight as well. but I do NOT like paying $70 for them! ;(
the 16x2 displays tend to be $10-$16.