http://www.dmv.org/wi-wisconsin/buy-...egulations.php
Quote:
Buying or Selling a Car Without Registration
A vehicle does not have to be registered to be sold. If you're the buyer, you will need to obtain either temporary or permanent license plates within two days of purchasing the car. You can do this at any DMV office. Temporary plates cost $3.
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I'm sure out of state cars require similar actions.