Safety King is the biggest in our part of the country. Sanit-Air is the only company listed that is licensed to use Ozone for the sanitizing process, all the other companies use Oxyne. The third project is to improve humidification. If your skin feels dry and sparks fly, you don't have enough humidity. The first thing to do is check the humidity levels with a good hygrometer.
Many people still have old-fashioned drum humidifiers on their furnace.
If you do, treat yourself to one of the newer, flow-through kind. When changing the furnace humidifier is not in the budget, get a warm mist portable humidifier. They are more expensive, but far more efficient than cool mist or evaporative console models. At the minimum upgrade to a 3M Filtrete or some kind of an electrostatic filter. These filters only have to be replaced about once a year and do an excellent job for most people.