The NGK Iridium you can get it locally (Advance Auto, OReilly etc.) for $7/each.
Online is not cheaper.
I have had this NGK Iridium now for a few years in my E39, smooth as silk.
Fuel mileage is excellent.
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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