+1 on perkins glass, on broadway south of pine.
I've gotten glass for 4 or 5 tanks from them, they charge half of what i've been quoted by all the other glass shops around here. Smallest was my 9x9x9 pico of 1/4" glass which was 14 bucks and change, up to ~$80 for a 24x24x16 out of 3/8" glass. And this is with all "flat polished" edges, which is the shiny edge with the small bevels like you see on all the $$$ rimless tanks like elos.
They have smoke gray glass too which is nice for tank backs and sump dividers.