I use self constructed melamine racks. They are very simple to build, taking only a few hours to build. I have Home Depot make the cuts. I back it with some insulating material(I forget the name of it). These racks all seem to work fine but they are not lightweight and if you plan on moving alot it might be a pain and the racks may wear quicker. Check out the habitat and cage contruction forum. It is very helpful and will give you alot of ideas.

Here is a pic of one that I built with five slots.

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