Welcome to the forum!
You've found a great place for reliable info about chams.
People here range from those who are very experienced with chams to newcomers.
It's always nice when people care enough to ask questions and learn how to provide their chams with all they need for good health.
All too often, people are given the wrong info by sellers and the consequences can be unfortunate.
Panthers and Veileds don't need quite as much humidity as some other species, like Jackson's but, as you know they do need a certain range
For Panthers it is 50-70%
Veileds need 40-70%
Many people don't use a humidifier and instead mist the enclosure frequently ---which also provides drinking water for your chams.
Misting is done either with a spray bottle or an automatic misting system, such as the MistKing or AquaZamp.
Some people do need both a humidifier and misting, since the air is so dry in their homes that it's the only way to maintain the proper levels.
Live plants are great to use.
They help retain humidity, while misting water drops that form on the leaves will be used for drinking and they provide some hiding places and things to climb for your cham.
There are more details to be found here:
https://www.chameleonforums.com/care/water/.
There are excellent caresheets in the Resources section, written by the forum moderators.
These caresheets provide care guidelines to help you ensure that everything is setup the way your chams need in order to be healthy and long lived.
Here are the 2 which contain more specific info on the types of chams you have:
https://www.chameleonforums.com/care/caresheets/veiled/
https://www.chameleonforums.com/care/caresheets/panther/
Carlton has given you some good info about humidifiers.
If you hadn't already thought of it--there is always Amazon
http://www.amazon.ca/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Ultrasonic+Cool+Mist+Humidifier+
Again, welcome to the forum!