www.IsettaBroker.com for $35,000 (a bunch of other photos there, too). It does appear it might have VW Beetle running gear, but I'm not 100% sure of that. Regardless, it's pretty wild.
And what else don't you see every day? A 1957 BMW Isetta pickup truck with a BMW Isetta body on it. Could this be the '55 Isetta for sale on Isetta Broker?
Thanks to "Steve B" for the tip!