The same wine is also available in 3l cubis at around 6.50. This is easier to store although a little more expensive. My sister usually visits over the summer and we see how many boxes we can stack around the kids ;D
At Christmas my job is to see how many I can bring back on Eurostar, last year I manage 10, although my back was still in a state in the new year.
Even the normal French supermarkets don't get anywhere near this value for money. And what has happened to the 'booze cruise' ? I haven't heard about anyone going on one for years.