I have only found one place that makes misting systems for herps, and from what i understand, they are really really good for frogs...here is all the information I have on them.
The RainMaker I is a self contained misting system that is programable, and it produces a fine mist which is perfect for any type of rainforest frogs such as dendrobates and any of the various treefrogs. It comes with a five gallon water resivoir, a 12 cycle digital timer, 20 feet of high pressure tubing and a high pressure pump with included misting nozzles. Up to 20 nozzles can be used with this system and more nozzles can be bought seperatly from Ecologic Technologies.
Im sure they will give you a more information on what they have to offer if you gave them a call, they also sell other things for herps like plants and cork.