The main purpose of outdoor floor carpet is to be rubbed, sturdiness is the primary characteristic that need to constantly be there. Lots of indoor outdoor mats get worn out over months of use because of frequent usage. Outdoor entrance mats start at about $35 but others range from $15 to $30 apiece. Indoor outdoor carpet is sold at retailers like Costco. They are also found at department stores like Staples. Some types mats you can choose from include rubber, aluminum, and cast iron. They each have their pluses and negatives when it comes to mold resistance and fading during the different seasons.