$15 a plug? Why? I pay like $8.50 for the NGK BR9ECM plugs from sparkplugs.com (Monarch products).
Been using them for my plugs for the past five plus years. They have all the ones I have ever wanted, and are quick on shipping. Prices are good on top of that.
Now my RS plugs are $31.00 a pop!
Thanks,
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Charles Gallant