Would you care to take a stab at how expensive? I will only need the one sheet, I am building the rest out of plywood. I am only looking for a "ballpark" figure. I live just outside Decatur, AL which is northcentral AL. I will call and compare prices with Ocean View, if you are right, that would be fanstastic.
I can't remember, in my long search for DYI instructions for building a large tank, exactly where I got these instructions, GARF, I think, but the "glass calculator" provided actually said 3/8" was thick enough for 24 inches in height, but I was going to use 1/2" instead. 1/2" is good up to 27" in height (according to the article). If the price is ridiculously higher than 3/8", I will try the 3/8" first.