I decided to finally jump in and get a coolidor. I currently have 7 humidors of various size and still need more room, especially for boxes!! I found the cooler at Sam's for $65. It is 150 quart Igloo MaxCold. I decided to use kitty crystals for the cooler, due to the high cost of the beads that I have in my other humidors.
The first kind of crystals were scented (oops!) so I returned those and got the ExquisiCat Unscented Crystals. I got 8 lbs for about $15. I also found mesh bags, meant for fish tank filters. They were about $1 a piece. Each bag holds almost 2lbs of crystals.
For shelving I headed to Rockler to look for Spanish cedar. They had planks, but only up to 5 inches in depth. The grooves in the side of the cooler are just over 7 inches. I wanted deeper shelves, so I bought the 5 inch plank, plus a 3 inch plank. I doubled them up in each groove after cutting them and voila. I have now moisturized the crystals and have the Spanish Cedar seasoning. I have about 4 lbs of crystals in there now, and will probably add some more once I have some sticks and boxes in there.
All in all, the project cost me about $120, which is cheaper than most humidors 1/4 of the size. I can't wait to start filling the thing!!