I bought two sets (16 s/plugs) from USA shipped to Australia cost me $188. That is cheaper than getting one set through the dealer. This means I'll be doing the spark plug changes too thanks to Peter's tool. Watch this space for any drama!
2007 E92 6MT - Silverstone II with /// Performance Exhaust with ACM Test Pipes and BPM Sport Stage II Dev-Tune - Proper engine warm up, 12-monthly oil change, Castrol TWS 10w-60
2014 F15 X5 3.0d