Part of my previous job was troubleshooting medical equipment across the NW USA. A number of my accounts were in California wine country, from Santa Barbara to Mendocino, with a good concentration around Napa. Being on the job I could not often stop for tastings, but I know the countryside well.
It always upset me that wines at many wineries were often priced higher than what was available in SF stores. In balance at least you could taste your purchase.