I just found a similar deal at a whole foods type market near me... $6.50 for organic apple juice, in carboy
I bought two, and some corn sugar. One has just corn sugar- about a cup, and the other has an 8oz bottle of cherry juice concentrate.
The juice alone tested at 1.050 SG, and the bottle with the cherry juice in it came out at 1.060 on the nose. The one with corn sugar is a little higher, maybe 1.065... i tested it before I added all the sugar so I'm not quite sure.
I just used a packet of Munton's dry yeast I had laying around... we'll see what it does. The cherry concentrate didn't really add that much direct cherry flavor, but it does have more body than the plain one.