Dryer duct replacement parts can be found at Lowe's, Home Depot and online sites like Amazon.com. Big-box retailers like Walmart typically carry a small assortment of dryer duct replacement parts.
Plastic dryer ducts are a fire hazard due to their lack of air flow and should be replaced with rigid metal ducts that meet UL specifications. These metal ducts allow air to flow more freely and do not allow lint to build up as quickly as it does in plastic ducts. If the ducts become clogged with lint, the chances of a fire greatly increase. Replacing plastic ducts with corrugated semi-rigid ducts eliminates this problem.