Well, there is an ethnic market I often patronize in San Jose (better foods, service, customers, and much cheaper than American chains).
I was curious how the customers there would react to the bag law.
First, the store does not sell reusable shopping bags. They did seem to be prepared for the new law, as there were stacks of paper bags at every checkout. Paper bags that would now cost 10 cents each.
Watching people check out, here's what I saw. No one brought reusable shopping bags, and no one bought or used any of the 10 cent paper bags. People brought some of the still-legal plastic vegetable bags to the counter, and asked the check out clerks to put small items in them. The clerks gladly obliged.
The larger items were simply put back in the shopping cart.
When it came my time to check out, I just followed the lead of the others.
So, it looks like at this market, Customers score one and Greens and shopping bag profiteers score zero.