I'm trying to figure out what bus fares in Buenos Aires are. I have read various websites but the quoted numbers are all over the place and because of the rapid inflation, prices change quickly.

I got the Sube payment card but I don't know how much to put on to it. Since the trip to the airport will be the last time I will be using the card, I don't want to overcharge it either.

Specific questions;

* Is there an "official" website that gives the current price for Buenos Aires bus fares ?
* Is there a "safe" upper limit for a bus trip from Plaza De Majo to EZE airport (line 8E) of what it might cost right now ?

Thanks !