We've had some luck with Vision Opto, although I'm not sure what you are calling a "bare panel" is what they sell. I believe all of their panels which truly are bare, accept a parallel interface of some sort with raw RGB values. If you can come up with your own drive circuitry though they have pretty decent prices. For example we got some 2" AMOLED displays for around US$12 ea. in quantites of 3.

Stu