Are you making upright nests or are you gonna use them for y-tong nests?
Because for y-tong nests I usually take glass from old picture frames or so, or just buy a new one, because they tend to be alot cheaper than buying from glass-masters. Y-tong nests generally don't call for any type of super glass.
But if you're making somethinig proper like a basin or an upright nest or so, I'd probably go for the cheaper of the two. Given I don't know a first thing about glass but I can't iamgine you'd need some extra expensive glass for this.

But a second input on this might do.
