I talked to several agents in my office who have assisted people with finding home rentals. They all said that since it is very un-common for homeowners to rent their homes out (unless they are actual duplex or townhouse properties). The best sources they found for rental postings were Craigslist.org.
You also may find some rental postings on JSonline.com (which is the Journal-Sentinel newspaper website). You'll find some classifieds in there.
Again, you will have more chance to find rentals of 2-family homes or multi-family units rather than single family homes here in the area.
Good Luck in your move.