Where is cheaper to eat seafood in Thailand?

I have eaten seafood in Krabi, Hua Hin, Bangkok, Pattaya and Elephant Island. Except for Bangkok, the prices in other places are actually similar, and I don't eat it every day. There is no need to go to a special place to eat seafood. Comparatively speaking, islands are the cheapest. Hua Hin is not bad either. There are some restaurants by the sea. You can watch the scenery while eating, but it's windy this season. Huaxin's night market also has some good restaurants, and the prices are quite cheap (compared with domestic ones). I personally recommend going to Hua Hin, which is close to Bangkok and has convenient transportation. It's good to stay in Hua Hin for two days and visit the seaside and nearby scenic spots. If you want to pursue nature, you should go to Elephant Island, which is more primitive. If you want to pursue the scenery, go to Koh Samui. If you want to pursue the scenery, you should go to Phuket, where China tourists will be bored to death.