How "restorable" can it be? There are two places I know of that might have one or have a lead on one. They're both in Ohio, though. One is Streetsboro Foreign Auto:
http://streetsboroforeignauto.com/ and the other is the Beetle Barn in Cambridge. They don't have a web site, but their number is (740) 685-6566. They have a few buses visible in Google Street View.