Originally Posted by Nonsequiteur
Do they generally have 36x18? I've glanced there but never really paid attention because the thickness was only 3/32 for everything.
1/8th is also available in 24x36 sheets. This is what I assumed you would use to double layer.
Socratic Monologue is of course right, glass cutters are everywhere and 1/4" glass is pretty common stuff. Probably cheaper to buy 2 sheets from Lowes and silicone them together but probably not by much....