Yes, I love a challenge. You are looking at $91.48 from RA. Parts Container on eBay is $66.15
https://www.ebay.com/itm/3521250959...M6GCKM&hash=item51fc4a901c:g:uP4AAOSwhwpkA6Ys
Parts Container is a vetted eBay seller I have used for over 15 years. The are an authorized reseller of NGK, Bosch, Denso, Mann, Motul, Hitachi, KYB, Bilstein, Sachs, Lemforder, etc.
Their price is $12.97 each when ordering 4 each or more, plus they have a 15% discount coupon, just click on the link in their listing. Your net is $66.15 plus tax, free shipping.
Parts Container does not have the absolute lowest prices on eBay, but at least you are guaranteed to get authentic products. They ship from either their warehouse in California, or they often drop ship from Worldpac or one of the other nationwide auto parts wholesalers.
I bought a set of 8 NGK Iridium plugs from them last month and decided to double check their authenticity on the NGK/NTK website after they arrived, and of course no problem, they were legit.
https://www.ngkntk.com/newsroom/blog/emea/fake-or-not/