http://www.famous-smoke.com/acrylic+...dor/item+13396
I have the steel version that was used as coffee can which I converted to a humidor for my coffee/infused smokes. This holds at 70% Rh for about a year now without any source. I would say that holds pretty damn good.
This will be clean and show off your smokes, wont hold 30 but a decent amount.
BTW here is my mod post on it. I check once a month with my digital hydro
http://www.cigarasylum.com/vb/showthread.php?t=60337