In all honesty, You can get iridums for less than $9 a pop.
NGK XI Iridiums (which I have used before with excellent results) are $6.88 each, Champion iridums are $6.40 each, NGK Premium Iridiums are $8.18 each, Denso Iridiums are $7.62 each, and ACDELCO Iridums (part number 41101), are...
$5.73 each. Rockauto.com. Go see for yourself. Yes that doesn't include shipping, but that also doesn't include the 5% discount code that is always available and you can find anywhere with a quick google search. If you bought the same ACDelco iridums that I provided the part number for, you got hosed. They call it a stealership because they rip you off.
Shipped price for 6 of those ACDelco iridums is $35.84 to my house in northern Illinois, which includes the 5% discount code.
2005 Pontiac Bonneville GXP - For Sale ----- 1995 Buick Regal GS(X) - L67 madness
2000 Buick Regal GSE - Stock...for now
----- 1987 Jaguar XJ-* V12 - 12>8