Advance Auto Parts has always been the cheapest. You can get NGK iridiums for 6.99 a plug there.
My Denso Power Iridium Plugs were 32 bucks shipped at SparkPlugAuto.com (cheapest i found for those because no local store carries them)
Just be super careful with the spark plugs. If you didn't catch a while ago, the threads broke off inside the head and I didn't even over-tighten them. Not too hard to remove but it was still a heartbreaker...
I just replaced mine at 7500 and there was a noticeable difference. The old ones were a bit rich and one had the gap completely closed, so I think it's a good idea to check 'em out periodically anyway. Also went from Denso IU27 to NGK CR9E.
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