There are a lot of steps you can take before needing to add a mister or any other additional equipment.
If you can tell us more about your setup we can get you sorted out without you spending unnecessary money. I live in MA where winter gets pretty dry. I don't even need to mist my enclosures in winter unless maybe to boost humidity during shed.
What type/size enclosure?
What substrate?
How are you heating the enclosure?
What type/size water bowl?