A local retailer can offer many benefits when you buy a mattress. Not only will you be supporting a local business, you will also get a great deal. There are several factors to consider when purchasing a mattress, such as your sleeping position and preferred firmness or plushness. You should also choose between an innerspring or hybrid mattress, a memory foam or gel-infused foam mattress, or an organic latex mattress. Avoid air mattresses. Six different sizes of mattress are available from most manufacturers.