I have Question about tickets for concert in Vienna..Help me
 

This is my first post on this board,and I need your help.
Can I buy tickets for concert in Vienna in music shops somewhere in Austria or I can only buy them on Internet?
I have this problem,coz I don't have credit card so I can't buy them on net. Does anyone knows where else to buy them?
Does Virgin Megastore in Vienna have them or any other shops in Austria?

Please help me,I really want that tickets :)
Thanks :)