I am planning on getting this rack from Animal Plastics: http://www.animalplastics.com/Sterilite/1754.htm
The feature that sold me on this product is the fact that it holds both 15 quart and 32 quart tubs, perfect for my current situation. Now before everyone tries to convince me to build my own rack system, I have already thought of this option, but for now, I have opted to buy one because I dont feel completely comfortable housing new snakes in something that I built myself, for now. At the moment, I have a small normal girl I plan on putting in the 32 qt tubs. In two weeks, I will have a lesser girl hatchling I plan on putting in one of the 15 qt tubs. Pretty soon, I will have a pastel girl in one of the 15 qt's too.
I believe they zigzag some 4" flexwatt (or 3") all the way up the seven shelves (or at least thats how boaphile does it). My million dollar question is do I need two thermostats for this setup? I was once told that I should never use the same thermostat for multiple enclosures, UNLESS the tubs and heating elements are exactly the same. This makes 100% sense to me; however, seeing as they zigzag the flexwatt all the way to the top, it seems pretty impossible to use two thermostats. Sigh, I guess this is another reason why building your own racks works so much better.