Hardware stores such as Lowes, Home Depot and Ace sell dryer vent ducting as do department stores such as Walmart. Online retailers such as Amazon also sell the supplies.
Brick and mortar establishments such as Walmart and Home Depot typically sell dryer vent ducting both within their stores and online. Such retailers often offer free shipping for orders over a certain dollar amount. They also usually allow customers to purchase the supplies online and pick them up in the store for free.
Amazon and other online retailers such as eBay sell dryer duct venting both from stores and from individual sellers. They also feature discounted prices and possible free shipping. Many supplies also come with reviews from users. Sometimes customers can buy used versions of the venting systems.
Dryer vent ducting typically consists of a white plastic or aluminum foil duct that's 4 inches in diameter. It connects the clothes dryer to an outside exhaust system. Such ducting is relatively inexpensive and easy to install. However, This Old House recommends replacing the plastic or aluminum foil ducting with rigid metal ducting. The smooth interior of the pipe creates little in the way of resistance to the hot air coming from the dryer. It also discourages the accumulation of lint, which can catch fire in corrugated ducting.