Paul knows a bit about making wine, and all about the supplies. A couple essentials which are not at the store are barrels and juice. The oak barrels have become somewhat pricey to keep an inventory, but are available at a number of online sites. The juice or whole grapes are available yearly in a lot on 35th and Racine from August to October. The supplier gets all product from California, and I will have more info when the lot opens.
In the meantime, stop in and say hi to Paul, grab some supplies, and wait for the juice to roll in. You could be on your way to making some good homemade wine!