In Germany, you can get a cheap beer a lot cheaper in a store though:

Of course:

• This is a very cheap beer. But the average German mass-market brand is at around 1€/0.5L too (Jever, Krombacher, Becks, Radeberger are the ones I checked).
• Sternburg used to be a lot cheaper, I remember it being sold around the 30ct price point a couple of years back.
• There is a deposit on bottles/cans but of course that will be returned when you return the bottle.