Glasfloss furnace filters can be purchased online from various vendors such as Amazon.com, Air Filters Direct and Filters USA. Amazon.com carries a wide range of products, while smaller sellers such as Filters USA and Air Filters Direct specialize.
Each of these vendors carries a variety of Glasfloss models, and each has different benefits. Some companies offer completely free shipping; others require a minimum purchase to qualify for free shipping. Some guarantee satisfaction, while others guarantee the lowest price. Certain vendors provide customer reviews of the products, and others offer a more scaled-back website, with simple item numbers and product descriptions. Some sellers also provide discounts for purchasing in larger quantities.