I've tried to find that kind of glass here in Brazil, but it's not available or at least it's not easy to find. Buying overseas will delay my prints at least a month...
I bought some PEI sheets some time ago, and they just came today!

Anyway I'm thinking that there should be some solution for my situation...
For PLA, I guess I can use normal glass with some kapton, since the glass won't go over 50C... that's the T° I'm using, with no problem at all of adhesion. Might be?
However for ABS... Since the T° for the bed is more than 110C... Should it work some tempered glass? Did anyone try with that?
Is there a way to use the PEI over other surface rather than the glass?
I need a solution for this situation ASAP or I'll have to declare my bankruptcy! hahahaha
Many thanks for your help!
Best regards!