I called one dealership and the guy quoted me $22.50. When I had a free oil change done at another they put 18.50 on the receipt. I'm not sure what to make of all the different pricing.

I bought two at Kragen when they had a 2 for $7 Fram filter special, which works out to $3.50 a piece. I also bought Mobil 1 0w-40 oil for $4.49 at pepboys and got a free mobil 1 filter with a coupon for my wife's G35 free. Keep your eyes open for specials from those two establishments.