Hi Zee,
Couple places routinely post 356 cars.
Best place is the 356 Registry
www.356Registry.org Check the classified pages.
Ebay has a yellow 64B coupe with no motor right now.
www.Craigslist.org Check California area for the most possibilities.
Bob Campbell sells a bunch at
www.356Sales.com
I found mine at Bob Campbell's place for 6 K. It was a complete car - just not assembled or painted. Motor/Trans/Suspension and Interior needed to be rebuilt. All metal work was done. Well, until I attacked it with a sawsall and wiz wheel ... but that's another story.
If I see one I'll PM you.
Jim