I just had a look on the ticket-site of Eintracht and there are only tickets available for the match in the beginning of May against Düsseldorf. There are available still around 1000 seats We only have 4 more home matches anyway until the end of the season and the other 3 matches are already sold out. The next home match will be against Bayern, that's always sold out. The last match of the season is always sold out too. And then we play against Schalke, which is also not an unattractive opponent.
I thought I'd try be clever and use Google translate so I could read the Frankfurt site and it turns out there is an English section.
Will wait till the new season starts I think. Didn't think they would see out that quickly!