There is a really big swap meet at Jefferson WI every spring and every fall. (2nd largest swap in WI) the Jefferson swap has come to feature a lot of off shore tools and a fair assortment of mowers, snow blowers, and snowmobiles. There is still a collection of car parts, project cars and a car corral, along with a car show. Its generic, you look pretty hard to find Mopar stuff, and look a lot harder to find much more then the generic Mopar stuff that has been around for several years. Occasionally you find the golden nugget you have been looking for.
Because of the shear volume of people wandering around, there are several indoor spaces that sell new car related stuff. As long as you don't expect to find anything exotic, (though sometimes rare stuff does appear) there is usually enough stuff there you can find some pretty cool stuff.
There is a guy there that sells new mag wheels and he always has an assortment of new lug nuts for about any wheel or vehicle you ever wanted at $1 each. These are the high quality solid lugs, not the cheap tin chrome covered junk.

The swap meet at the old dealership in Rockford is pretty new, I think this is the 3rd year. Its a pretty cool place for an indoor swap, and there is a lot of neat stuff to look at. Swap spaces are free, and there is no cover charge for spectators. I usually haul a load of stuff over, don't need to sell much to make a profit, or get a little money to buy something else. Even if you didn't sell , or buy anything, just checking out the stuff that is there is worth the trip. Gene