The Kamala Market is much the same as markets all over Thailand. Twice a week, on Wednesdays and Saturdays the market is open year round. Kamala Beach is a Muslim community so you won’t find any pork products here.
I can’t go shopping with my wife because if I do she can’t get the “Thai” price. Yes, there is a two tier pricing system but this is the case all over Thailand. Negotiate everything maybe you’ll be able to get the Thai price too.
You don’t even have to go to a grocery store even though one is across the street. I’d say we do 90% of our shopping for food here. Everyone turns up the market eventually. Food is delicious and cheap. Highly recommend you stopping by your local fresh market.