It's tough to find a good condition VW van now. There are probably a couple running on the roads. But those belong to enthusiasts. Even if there's one on sale, if the condition is good, u'll be looking at about $40-50k. Anything cheaper, the condition is questionable. You will need to know a reputable and reliable workshop who can do the servicing for you. Parts may be difficult to get as well.
But as an aside, vintage cars are really beautiful. I'm now at this stage in my life where I prefer the looks of vintage cars to the new cars. New cars doesn't evoke anything in me nowadays. =)