Here is my Reptile mister. The tank was about $10.00.
The timer was about $20.00. I run this timer during the summer set for every 8 hours four 2 minutes. During the winter every 12 hours for 2 minutes.
Odds and end to get the tubing together was $7.00
I also have a tubing coupler that goes from the tubing that came with the tank to standard 1/4 inch drip line tubing.
And the mist heads. I think these are toro and if you can find this model/type they produce a pretty fine mist. Others that I tried make more of a stream. I think this is due to the pressure being higher than you would have in a regular drip system.
I have used this system with 3 heads but I think it would support many more than that.