Concentrate is one step removed from the vineyard. It is a factory product which is sold to wineries, to the grocery store juice market, to natural foods producers which market “no added sugar”, and so on. This is readily available in 1000 pound totes and smaller drums. ,,, How much are you looking for?
In the old days Welches cooperative on Lake Erie produced 12 oz retail frozen concentrate. Currently Old Orchard is selling a 100% natural concentrate. Coloma Foods is selling half gallon sizes of concentrate through 55 gallon drums. Concentrate is available in several varieties of grape and other fruits.