Where can I buy a rocket launcher to protect my family from a tyrannical government?

When I get back from my holidays I want to purchase a rocket launcher as I'm afraid of the government trying to take my guns away and I realize I will need more firepower than the 2 handguns and one shotgun I have. They don't sell weapons where I am at the moment (England) so I can't even get a rough price for for any type of weapon. I live in New York and I know it is not that safe there, even though I have been assured by the legendary Michael R. Long (chairman of the NY Conservative party in case you don't know).

So, what price are they?
Where specializes in them?
Can I buy more than 1?
Should I get grenades too just in case?

Thanks a lot.

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