I'm planning on travelling between Paris and Etampes every Mon-Fri for the 4 weeks of July this year.
Could anyone advise me what the different train ticket options are and how much they would cost?
E.g. daily, weekly or monthly ticket prices?
I'm 21, and so not sure if I can get some sort of youth card or discount?
Apologies if a similar thread already exists - please direct me there if so!

Thank you very much for any help.

M x