There is a well established Sacramento restaurant and wine bar that features ten (10) wine flights (Three 2oz tastes per flight).
Each flight is priced according to the wines that are featured in the flight... At this moment in time, the cost for a flight ranges between $9 and $16. If this same restaurant and wine bar were located in San Francisco, I would expect the prices to be considerably higher (50% higher or more).
They also offer wine-by-the-glass (not positive, but I think that they are 5oz pours), which include any of the thirty (30) different wines that are featured in the flights. As with the flights, the prices vary for an individual glass of wine.
What's really great is the fact that they have almost 1,000 selections on their restaurant wine list and they make routine changes in the wines that are offered in the flights / wines-by-the-glass.