Boards
Cheap stuff thats as good as the expensive version
Some people say beans, which is wrong.
Some people say tinned toms, which I'd go with.
Other areas of debate include, toilet paper; toothpaste; washing up liquid etc.
But not only food/household items of course. What about that premium petrol you can buy? WTF? I accidentally filled up on this when about to return a hired van after moving house. I must say though, the five minute drive round the corner was well worth the extra £13.65 or whatevs.
Lets hear some more.