G-20 Security bill

With over a billion dollars already spent on G20 security, perhaps its time to ask the question:

Can we sacrifice some security to save some money? How much would G20 security cost if we only provided security to the following world leaders:

1. Prime Minister of Canada
2. EU Commission President
3. EU Council President
4. President of France
5. Chancellor of Germany
6. Prime Minister of Italy
7. President of Russia
8. Prime Minister of Great Britain
9. Prime Minister of Austrailia

That's it, just protect this core crew, and leave the rest to the mercy of whatever flavour of the week NDP protesters feel like showing up.