The prices of humidifiers are different for different brands and types of humidifiers. As there are many brands and types of humidifiers are available in the market, so you can easily choose the one which you think cheap for you. The cheapest humidifiers are the tabletop humidifiers and they can be bought at prices between $20 and $80. In these types of humidifiers, if you can pay a little more, then you can buy the big tank humidifiers as it will work for a long time. The big tank humidifiers will cost you anything between $100 and $180. If you want a full house humidifier then be ready for spending $250 and above. To fix them you will need to take help from an expert but they are quite maintenance free.