Hello Zoittuecke34
No offers are available between Genève and Annecy, prices are always the same. Regular tickets (Léman Pass) are available in the SBB Mobile App, on sbb.ch, on vending machines or at the ticket offices, but not months in advance. Such tickets are only valid in the selected trains and/or buses, wait to know your timetable before you buy them.
Kind regards
Danhiel
PS Sorry, I didn’t see that Krist was faster as me.