If you are only interested in the cheapest way to get hammered, I recommend cheap vodka or similar.
If your looking for the cheapest way to get wine drunk, I'm guessing probably boxed wine.
If your looking for the cheapest way to get a bit buzzed without anyone noticing because you haven't had that much, then I recommend mixing cheap vodka and box wine until you find something potent but still sipable. Then pour that into a bottle left over from a more expensive wine. (But not one anyone your drinking with would want a glass of)
If your looking for the cheapest way to get wine drunk, I'm guessing probably boxed wine.
If your looking for the cheapest way to get a bit buzzed without anyone noticing because you haven't had that much, then I recommend mixing cheap vodka and box wine until you find something potent but still sipable. Then pour that into a bottle left over from a more expensive wine. (But not one anyone your drinking with would want a glass of)