BusPlus (Belgrade)

Hello everybody!
I had some question about the bus ticket system here in Belgrade, BusPlus, which I hope some of you can help me with!
Right now whenever I take the bus I put on this carton card 72din per ride. I was wondering if there is some (cheaper) alternative to this when making the same ride twice a day five days a week. I read something about a "personalized smart card", can this be of any interest for me?
Thank you for any help!

Kind regards,
Willem-Victor