Pvc sheets. You can buy them at home depot. It is more expensive than melamine, in my area about $40 for a 3/4" 8x4 sheet. It won't hold enormous amounts of dirt needed for monitors but will hold enough for a tegu. However, it is water tight, and really light as well, which is why I suggest it.
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Thank you very much, i will look into is as i'm going to be building the tank very soon.
1.0 Normal BP
1.0 Mainland Reticulated
1.0 High lines Red Tail Boa