IHS estimates the flexible OLED used in the GS6 Edge at $85
Market research company IHS says that the Galaxy S6 Edge costs about $290 to build (that's the 64GB model sold on Verizon) - and the flexible curved super AMOLED display (5.1" 2560x1440, 577 PPI) costs $85. Just for comparison, the GS5 BOM was estimated at $256 (and the regular GS6 is probably somewhere in between).
Other expensive parts include the application chip ($29.5), the 3GB of DDR4 memory ($27) and the 64GB flash memory ($25).