When I was much younger my grandmother was always complaining that she could never find grape preserves anymore. That was maybe 20-30 years ago.  I recently started looking for grape preserves and am unable to find them. I can find black currant preserves, blueberry preserves and just about any other fruit under the sun. But why is grape preserves so hard to find?  I thought maybe it has something to do with fermentation and wine? But I cannot find any information. I am not talking about grape jelly, I am specifically talking about grape preserves.  Other than making them myself, where do you find any in a store?  ** If you do not know the difference between jelly and preserve, you can read about it here.        In jelly, the fruit comes in the form of fruit juice. Jelly has the   smoothest consistency and is usually clear.    In jam, the fruit comes in   the form of fruit pulp or crushed fruit. This makes jam less stiff   than jelly.    In preserves, the fruit comes in the form of chunks in a   gel or syrup. Preserves will have more fruit in them than jam will.   Marmalade is a type of preserve with citrus fruits in it.     
It could also possibly be because the modern varieties of grapes commercially grown for eating do not make a good jelly or jam.  Having made jam with a variety of grapes I have found that most of the grapes we buy as table grapes make a fairly ordinary jam whereas if you can get hold of older cultivars, grape jam/jelly is an amazing preserve. 