I would have to disagree with anybody who recommends buying a Thompson Humidor. The one I bought had a glass front, opened like a door and had 3 drawers in it. I was never able to keep the humidity stable. I was told it could have to do with the weather, the heat in my home, the amount of (or lack of) cigars inside of it. I far as I could tell the seal was good. I put it on e-bay and sold it. The guy who bought it e-mailed me with this response:

I purchased your humidor and have purchased several locally, online and on e-bay as an effort to enhance my own custom humidor construction project. Yes, I took you Thompson humidor and totally destroyed it. Removed all the hardware, checked the calibration of the hygrometer,(off by 15%), removed the liner, door inner trim, exposing the inserts of the box. Like all the others, it was made of cellulostic fiber-board with a fine sliver of Spanish cedar. Mostly for looks, I don't see how enhancements can be made to any cigar with this method of storage. No problem, just what I expected. I have recently purchased one more, an Italian made desk top and exposed it as well. Same results, however it did have a Honduran mahogany liner of about 3/8" thick but only on the sides of the box. That will conclude my research. Results of all the humidors purchased were pretty, but not practical for a real cigar aficionado. I understand why mass production forces manufacturers to utilize such techniques during construction but don't understand why consumers buy these boxes. They really don't do much for cigars.
If price is an issue as it was with me, I would have to strongly recommend some type of a cooler. With summer approaching they are everywhere in all different sizes.

Just my 2¢