try www.tirerack.com What are you looking for? 225/40-18's or 215/40-18's. The cheapest 215's are the Yokohama Parada Spec-2 and are only high performance tires. Being that you are from WI I would think that you want all season tires, unless you're throwing your stock rims on during the winters. If you go with the 225's the cheapest are the Kumho ECSTA Supra 712 at $99 a piece, again high performance. I've been recommended the Sumitomo HTR's for the 17's that I want. They also make 225/40-18's for a pretty reasonable price of $112, and the best thing is they are all seasonal high performance tires. Hope this helps. Later

 

The price on the 215/40-18 Yokohama's is $129 on tirerack. I forgot to list that price. You'll have better luck searching for 225's, a hell of a lot more to choose from.