Replacement air vents can be found online at HomeDepot.com, Lowes.com and Amazon.com. Additionally, Home Depot and Lowe's offer a selection of replacement air vents, grilles and registers in-store. All three vendors offer full product descriptions, customer reviews and the ability to refine searches by price and brand.
Brands offered at HomeDepot.com include TruAire, Decor Grates, SPEEDI-GRILLE, Architectural Grille and Copper Mountain Hardware.
Lowe's sells vents in oak, white, various colors or unfinished. The company also sells a selection of decorative or basic vents.
Vents on Amazon.com include decorative, steel, bronze and wooden. Brands sold on the website include Decor Grates, Accord and Fieldsheer.