This is the cheapest way to get drunk in the UK. 7.5% cider, 3-litre bottle. That's 22.5 units of alcohol in one handy plastic bottle.
This is 50% extra free. Available in Threshers and various other off-licences.
Compared to Special Brew, at £1.30 for a 9% 500 ml can - just 4.5 units, you're getting five times as much ethanol for only twice the price.