This morning I spent approximately £20 on new-house-related stuff. Yesterday I spent something in the region of £200, and the day before that I spent about £2000 (mostly on white goods and furniture).
The progression stops there, because the day before that I bought the house itself, which (regrettably) cost me really quite a lot more than £20,000.
But tomorrow I might at least try to think of something house-useful I can buy for about £2, although 20p the day after is probably infeasible, and 2p the day after that is certainly silly.
I don't think they qualify as useful, unless I use them to prop up a wobbly table leg or something :-)
A couple of cable ties? They always come in handy....
Of course, some things are sold by weight, so you could buy a 1/3 of a sweet or ten resistors, or 1/30 of a banana...