You don't need humidity to grow carnivorous plants, most of them will not die if given conditions less than ideal. Let me crack that myth now!!!!!
When I first started growing I was in the same mindset you're in now. But don't worry they will be fine in room humidity. Did you know I am growing plants from borneo and the phillipines on my windowsill in average room humidity, I don't mist them either. They grow great!!!