The guy you want to talk to is Mike Martelli Jr. At Federal Produce. Their prices are lower than through a home brew shop, though you will need access to a Destemmer (and later a press). Last year they had a wide assortment of grape varieties, some of which I had never heard of.
John and Nancy Behrs from White Water Hills have also sold grapes in the past, though I don't think they did last year.
Where are you located? I am in Erie, CO. It might make sense to do a group buy if a few of us decide to source grapes from Grand Junction...
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