My experience here is based on almost 20 years as a trained, professional fishmonger.
Gulf Shrimp. It's wholesale with a small retail side. As for Chad, he's the owner and can get you whatever you need whether it be 2-3, 3-5 hardshell as well as local trapped, which is about the tastiest around, not being penned. Not to mention he can get anything else you want. RT 84 in Southington.