<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by USAFAN:
Is it this one?:
Grande Arche de la Défense - Gare de Lyon Sunday and Bank Holidays only
http://www.ratp.fr/ParisVisite/Eng/P..._g/balabus.htm
This one goes only on Sundays and Bank Holidays. My French is so bad, but it looks that you need more than one ticket, at least when you go past Porte Maillot?
...Balabus run from stops marked ‘Balabus’ from mid-April to mid-September, passing key sights between the Grand Arche de la Défense and the Gare de Lyon. Details can be obtained from any metro station...</font>
That is indeed the one.
RATP has recently changed their policy to a single ticket per bus ride/trip.
I believe that single ticket for the entire line will suffice.