I take a DART train and a Dublin Bus to commute to UCD. They sell various types of tickets and I am using ADULT 7 DAY SHORT HOP (BUS & RAIL) which costs €29.20 a week (the ticket shown above). In my case, it is slightly higher than the price of ticketsf for four days' commute. In other words, it doesn't save much if I just commute to UCD on weekdays. However, it gives me more flexibility, such as taking different paths (change the station to transfer between DART and Dublin Bus) or going to the city centre on weekend days. The movie shows a scenery inside DART train (just an experiment of the vlog feature of seesaa).