idk how cypress mulch works humidity wise, i use coco cause it holds ALOT of water for a while.
i got mine form walmart for ten bucks:
be sure to do a salt humidity test though:
http://cigars.about.com/od/humidors/qt/hygrometers.htm
and you'll need to find out what kind of salt you have too:
http://www.cigarpass.com/forums/inde...howtopic=33711
hope this helps