Wont be able to get a complete answer until you know what states the WI permit will be recognized in.
But until then....AZ, FL, or UT would be the 3 to look at. Each will cover you in about 30 states.
AZ will cost $60, a copy of your WI permit will suffice for training req, can be had thru mail in about 2 weeks.
UT will cost about $65, you will need to take a UT-specific safety class, thru the mail in about 45 days.
FL will cost you $117, will need a copy of a certificate for a safety class (class you took for WI permit probably suffice), thru the mail about 60 days.