hey,
You can also try to visit Atletico de Madrid stadium, it would be cheaper, and foreign people don't use to do it, so you could be a little different haha. I've found this webpage, and if you go to the
Atletico Madrid section of www.madrid-football-tickets.com you could get the tickets. However, if you still want to see Real Madrid, tickets are available aswell.
I've never bought tickets there but it's just to show you that you have options
I hope it helps u!