Almost everyone is aware of the law of supply and demand.  As demand for a product or service increases, the supply will eventually catch up.  This law is most evident in the case of mold and mold testing kits.  It is a fact that mold growth indoors has become a common problem for many homeowners.  As more people became inconvenienced by mold infestation, more people sought a solution to their problem.  Testing the home for mold proved to be the first step in addressing the mold problem, and plenty of manufacturers provided what they knew homeowners (and other property owners) wanted: mold testing kits.  Right now, there are many testing kits sold in hardware stores, home centers, specialty stores, supermarkets, even pharmacy chains.