Large but inexpensive item for dd?

[llynnnn]

Does anyone have an idea for a 'big box' item for my 4 year old dd which doesn't cost much?

We thought we were done with the dd's presents, but looking at dd1's pile of quite large items (inc desk, stool, lego sets), dd2 items of furby, Barbie, puzzle ball looks small!

Just looking for something to equal out the pile sizes for Christmas morning!
Thanks

The works do cardboard playhouses for £10

At Argos they do a Chad Valley castle made of cardboard for £10 which come with pens to colour it in. We had the playhouse one a few years ago and it was great for the price.