If you were in SE Iowa instead of SW Iowa, you'd drive around and see that everybody has a VT tool in their yard for just this reason.  Making big clods with the disk or cultivator and then baking when it quits raining for three weeks isn't the answer either.  

From a couple conversations with a friend who was looking for a Phillips harrow, good luck finding one that isn't either brand new or hasn't been beaten like a rented mule either- but that's the sort of tool you need.