During these months, the shrimp that you get is usually very fresh and has not been frozen. In other months, shrimp will usually have been frozen but if it has been handled well that will not make much difference in the flavor. They have probably been poached or taken illegally but the prices are moderate and they are fresh. The bigger the shrimp, the higher the cost and the greater probability of the flavor that you really want. Jumbo shrimp that run twelve to 16 to a pound cost about ten dollars a pound.
Large shrimp can be half that price.
Smaller ones have almost always been frozen and thawed several times and are usually tasteless. Occasionally you will encounter mixed sizes and broken shrimp. These can be a great buy because of the pieces of jumbo and large shrimps they contain. There will be some that are pretty small as well. You can catch your own shrimp as well if you are out for an adventure.