Interestingly enough, I believe that the TSA rules on liquids, combined with domestic airlines charging for checked baggage, have effectively "broken" whatever obligation to purchase wine at the winery that may have existed here in the U.S. In any case, I simply ask the folks in the winery tasting room who sells/distributes their wines in San Diego, and explain that I am only traveling with carry-on luggage. It's invariably true, and I cannot put wine in my carry-on in any case.