I will be arriving to paris, on Sat. late at night(Sun. morning).
I heard the Navigo validity starts only on Mon.
So, is it possible to buy the Navigo Decouverte for the coming week I'll stay there on Sunday?
I mean buying it on Sunday and using it the next day(Monday).
Where can I buy the Navigo card? at all metro and train stations? or just specific ones?