According to this article, Delta is now allowing passengers at five airports in California to check wine for free, up to one full case. The article mentioned that Alaska and Southwest already do that, and so now you have another option.
There are a few caveats, of course, the main one being that you must be a Delta SkyMiles member, but I would think that most travelers on this forum who fly Delta are members. You can read the details in the article.
It makes me want to take a trip to wine country and bring home some California wine. 🍷🧳