This group is always happy to help students, but we have to understand your objective better. It sounds like Ian thinks you're talking about wine tasting groups, not merchant-based wine sales programs where by joining their club you agree to receive (and pay for, of course) a shipment of two bottles a month, say. Most people are members of at least one of the former. More information about your task and some sample questions would help us help you.
My wine shopping and I have never had a problem. Just a perpetual race between the bankruptcy court and Hell.--Rogov