Where can I buy a Ford Focus 2.0L duratec engine block online?

I need to buy a new engine block for my 2007 ford focus - it has a 2.0L Duratec engine, can anyone help me. Where can I buy one of those online? And if any of you guys live in UAE, can you give me extra information on where to buy this engine block or where can I get a price. Thank you very much everyone.