Good morning Ilovezermatt
E-voucher can be obtained on our webshop: https://commerce.sbb.ch/de/gutscheine/gutschein-sbb-und-oev.html.
Please note, that may vouchers are also given out as form to say “thank you” and are either found in magazines, send by post or given out during limited time periods online.
If you like, you may consult our staff at any SBB ticket office or give us a call anytime 0848 466 688 (CHF 0.08/Min).
I wish you a pleasant day and a happy new year! Cheers!
Best wishes,
Michèle P.