LG Chem started developing "truly flexible" plastic-based OLED panels back in 2013, and they recently finished that development effort with sample production already underway. The company now released this video showing the panels undergoing some flexibility tests (including the hammer test):
Currently LG Chem offers samples for $250 each, and mass production of these panels is expected by July 2015 - which will also mean a lower price. Those panels offer 60 lm/W, 75 lumens, a color temperature of 3,000K and a CRI of over 85. The bending radius is 30 mm.