I'm really confused about what glass I should use for my i3v I'm assembling. I've talked to glass shops and they say borosilicate (Pyrex), anything else will shatter. Makerfarm recommends cheap $3 glass. I can find nothing definitive about the subject. Does anyone have any recommendations, opinions, etc..

I've found some borosilicate glass in the right size (214mm x 200mm x 3.3mm) for $28 but is that really worth it?

Thanks in advance.

Dee