I prefer the plexiglass Critter Cages for reptiles over the glass tanks. The top is screened and has a perfect place for me to hand my water bottles. I have three 20 gal long tanks. I donated my glass tank to the SPCA because it was too heavy for me to carry. The plexiglass are MUCH lighter
I have a store here called Pet Supplies Plus and they have 1/2 off sale on Critter Cages. So that is where I get mine from. I paid about $33 for a 20 gal long tank. So that is a good sale for my robos.
That's about the same price as a glass tank considering that you have to buy or make a lid. They have 40 gal plexiglass tanks as well. I don't have the space for a 40 gal tank, unfortunately.