A 3 rack system at CSerpents will cost you $310.00 (including shipping)... For around the cost of the shipping alone ($65.00) you can build your own melamine rack. They are very simple to build, require very few tools and very little skills and they are much higher quality. For maybe only $50.00 more you could build an even nicer one out of PVC. Lowes/Home Depot will cut all of the pieces to size for you right in the store and all you have to do is drill some holes, screw it together and install your heat tape when you get home. Most of these commercially available racks only come with 4" heat tape as well. I don't feel that is really a large enough heat source for an adult snake. I use 12" heat tape on my 41 qt. racks and 6" heat tape on my 28 qt. racks. The general rule of thumb is, the heat tape should cover about 30% of the length of the tub. So, i'm not sure why these companies are only using 4" on most of the commercial racks...

I'm using 3 different Vivarium Electronics VE-100 thermostats on 3 separate 10 tub racks (2 - 41 qt. racks + 1 - 28 qt. rack) and i've never had a problem with any of them. I have a 4th one hooked up to my incubator as well, but I haven't used it yet...