Least expensive possible setup for a screen/microcontroller/battery?

I've been toying with the idea of a project that would involve multiple (small) screens showing simple messages and animation. I'm open-minded about screen tech, and size can be small. Processing power and memory can be very low end. No need for wireless. Ideally the cost would just a few dollars per unit. Is this conceivable? I can't seem to find a source for all the parts at a total cost under about $30.