as far as i remember there are 2 ticket-sell-phases, one was already some months ago and one after the qualification (december or january...). there were 3 different types of tickets:
1. random game (group, 1/4, 1/2, final), you couldn't pick a team because you didn't know who will be at the Euros. you could get for example: game 2 from group D or a semi final (which was of course more expensive + the demand is bigger so less chances to get one).
2. follow your team (group): this one costed 240 € (a good price for 3 games imo), of course you get your money back if your team don't make it.
3. follow your team (tournament): this one costed something like 600 € (can't remember), you get money back if they get eliminated before the final.
i didn't participated in this lottery (i wanted the group tickets, whole tournament was too much money for me). chance of getting a ticket was 1:20, i was to lazy in the end to try out if i'm a lucky guy.
i guess it will be even harder to get a ticket in the 2nd selling phase. the best thing will be trying to get one from FRF...
if you guys have questions or need help just ask your Austrian buddies