I got one of these at target and just put a piece of tubing out the top I didn't seal anything up - and put it on a high plant stand between my two cages with the tube going to the top of the Jackson's cage - I had problems with it getting clogged up until I started using filtered water (they want you to use distilled but I'm too cheep - I'll use it for the mister but not the humidifier)
It kept the humidity higher in the Panther cage just being next to it - and in NJ humidity isn't as much of a problem as in some places - I found it easier to clean without sealing it up - when it clogged I ran some vinegar through it and it started working again (i made sure it ran for a while with new water and didn't stink of vinegar before I put it back with the chams)
http://www.target.com/p/crane-drop-...45615#prodSlot=thematic_medium_1_5&term=Crane Cool Electronic Humidifier