Next to Wat Hua Wiang, not far from the airport, is the city's main fresh market. Although you'll find many stalls open here all day, the best time to visit is in the early morning, when the market is in full swing.
The market seems unusually large for such a small city, but its the only market around. As with all Thai markets, although the emphasis is on fresh fruits, vegetables and meats, you'll find just about everything on offer, including clothes, cookware, and just about anything else needed for the Thai home.