Industrial Technology Research Institute from Taiwan has made paper-thin speakers called Flexspeakers. They will be currently sold in the dimensions of 8.5 x 11 inches sheets costing $20. They will be available in much larger sheets or even rolls. The speakers are made by layering thin electrodes and a prepolarized diaphragm between two thin sheets of paper. Their first application is to use Flexspeakers in cars and next as movie theater posters. There is one catch to this though; the frequency response is only 500 Hz to 200 KHz which does not favor any serious listening unless it is going to be attached to any sub woofers.