08-09 new ones are about 200 dollars.
You can find a set as low as 170 shipped from E90Post vendor but mostly 180-200 are normal discounted price.
Fair price for OEM used set is about 150. You don't have to go any lower than that.
PAST: 11 E70 X5M | 08 E90 M3 | 08 E92 335i | 03.5 E46 M3 | 99 E36 M3