Hm I highly doubt it you could get anything more than a cup of coffee with 0.50 euros even online.
Where can I buy a cup of coffee for .5 euros? I don't think I ever saw a coffee this cheap
Lots of student run cafees at my university sell coffee for .5 € Some even sell for .4 € but then you have to wash the cup yourself.
50 Cents for a coffee is a reasonable price if you dont pay for the starzac logo.