GameCraft Miniatures have released a set of inexpensive 1:285th scale bombed building terrain pieces.
From their announcement:
GameCraft Miniatures have launched a line of inexpensive bombed city buildings that will allow the gamer to put together a large city without exceeding the war budget.
These structures are precision laser cut from high quality mat board (like what is used in framing photos) and produces structures that are great looking, durable and inexpensive.
Similar structures are in the works presently for 15mm and 20mm as well.