I need to get from Linz to Prague on August 8 with my girlfriend. We went on to the Austrian train website (oebb.at) to purchase tickets. We found a direct train (EC 100) that leaves at 16:54 when using the route planner. When clicking on "Ticket by Post," unfortunately the rest of the pages are in German to purchase a ticket. It appears the normal 2nd class price for this ticket is 35.80 Euros, but there was a 19 Euro ticket option as well (with a green clover symbol next to it). We both clicked on this separetely and began to fill out the information. While my girlfriend purchased it successfully, I got an error message at one point and had to try again, but the 19 Euro price was no longer available.
I have been trying it everyday for about a week, but the 19 Euro ticket still doesn't show up. I am guessing that this offer has expired or is no longer available, although it shows up for other days.
Any tips how I can still get this 19 Euro ticket for the same train as my girlfriend? If this is not possible, should I just wait until I get to the Linz train station to purchase the full-price ticket (35.80 Euros) or should I purchase in advance (if the train is likely to be sold out or it is more expensive at the station)?