Back in the 1960s and early 1970s I used to drink a jug wine called Zinbardel. They stopped making it and I haven't been able to find it since. Does anyone still make Zinbardel wine?
There is nothing called "Zinbardel". The only thing close is Zinfandel. Just in case I was missing something I did a google search on ZinBARdel and it had only 6 results. One of them was your question! Now if you are talking about ZinFANdel, all you have to do is go to your closest supermarket and buy a jug of Gallo Zinfandel.
The marketing strategy of labeling wines below the luxury or super-premium price points with grape varietal names was just emerging in the late 60s or early 70s. So the product name may not have been a varietal; as a "jug wine" it may have been a marketing name for a blend (perhaps Zinfandel & Barbera).
Alternatively Hugh Johnson's Vintage: The Story of Wine states that a vine called 'Black Zinfardel from Hungary' was offered in the 1830 catalog of the Princes of Long Island nursery (p 364). Could it be a memory lapse?