Originally Posted by ambilobe
I could probably just use a 36 x 18 fish tank lid
The chance of an aquarium top fitting an ExoTerra well enough to prevent frog escapes is remote at best; 36 x 18 is the nominal size of the tank itself, and only approximates the size of the tank/viv.
For glass, yes 1/4 inch from an actual glass shop is best. You can order glass online, too. I've ordered from these folks before:
The cheap and easy way (which I do, although I do know how to cut glass) is to cut plexiglass inserts to fit on the Exo top, in the screen areas, simply set on top of the screen. Easy to cut (table saw is best but a utility knife works); I cut a few different depths (front to back) so that I can insert a larger/smaller piece for differing ventilation needs depending on season or the specific needs of a certain viv. Yes, they warp from the humidity differential; I clean them every couple weeks and then flip them over so they warp the other way. With the screens in place, the warping isn't an issue at all.