Northern Ireland had one of the cheapest prices for two litres of milk at 49p.
http://news.bbc.co.uk/1/hi/northern_ireland/3241639.stm
I remember in the late 80's in Portadown, Stewarts and Dunnes had a coke war (not the type you would expect in Colombia) but Coca-Cola. Prices dropped to 7 pence a can. My mum never allowed soft drinks in our house due to the damage to our teeth, surprisingly when coke was 7p a can we would go off on holiday with cool boxes overflowing with coke.