Isaacson & Stein
800 W Fulton Mkt
Purveyor of fresh and frozen fish who sells directly to stores and restaurants, but has a store for the public. Come early in the day, bring an ice chest and take home the best fish you can find in Chicago. From whole red snapper to fresh mussels, these guys have a huge assortment of fresh and salt water seafood with prices that are hard to beat. Open Mon-Fri and they provide free ice to chill your purchase.