Thing to do is take a drive down to Kemah. But before you go over the bridge, turn off into Seabrook and find Waterfront Drive, where the shrimp boats dock. There are at least half a dozen fish markets there. The prices down there are great--but be careful! This isn't Central Market.
You have to look over the shrimp carefully to make sure there aren't giving you any that are turning black. And I heard the bags of live crawfish aren't very good--they contain a lot of crushed ones. -- Robb Walsh