I've just been into my local Boots (Edinburgh - Princes St) and they have LOADs of these on the shelves for £1.
They are normally £4 (also 3for2) or ~ £8 in most other places.

Many other deals such as kids globe for £7.50,
Moon sand kits for £4.48 http://www.boots.com/shop/product_details.jsp?productid=1092813&classificationid=1047680
and loads of reduced kids toys.

Check for discount codes to use at www.boots.com