Napa tastings are bloody expensive ($20 for a flight, saw some for as much as $45) while Sonoma was much cheaper and sort of similar to what you'd pay in Okanagan: $5-10, waived if you purchase. Napa was also much busier and a nightmare to drive through at the end of the day.
Both were amazing though. Probably lots of packages out there that can make tastings in Napa more affordable
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