I have my set of four Mustang Pony Package 18" rims/tires up for sale. The rims are in 7/10 condition and have minor curb rash on a couple rims. I have my Blizzak's mounted on them right now, 235/50R18, which are in great shape with only a season or so on them. You can buy the rims for $600 plus shipping and I'll take the Blizzaks off (I still do have the original Pirelli's which have another short summer left on them for sale as well, $100 for all four tires) you can buy just the Blizzaks for $400 plus shipping, you can buy the winter set up (Rims/Blizzak's) for $900 plus shipping. The sale would take a couple weeks, due to not having my summer set up ready to go yet, but I can work with the buyer to speed up the process. I'm also located in the Chicago and would be willing to travel up to 60 or so miles.
PM me if you're interested or if you would like to see detailed pictures of the rims/Pirellis/Blizzaks. Thanks for looking!