Change Blog Address

That's correct. The warnings are clear. Deleted blog URLs are not recycled, regardless of who registered and deleted them and no exceptions are made except for the one stated at http://en.support.wordpress.com/recycling-blog-names/.

You can register another .wordpress.com URL and then purchase an upgrade plan so you can map to an existing domain.

Register another .wordpress.com blog http://en.support.wordpress.com/register-a-blog/

Purchase a domain mapping upgrade knowing it does not matter what the underlying .wordpress.com address is when you are domain mapping.
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http://en.support.wordpress.com/domain-mapping/

http://en.support.wordpress.com/domain-mapping/register-domain/

Source : https://en.forums.wordpress.com/topic/change-blog-address-44

Change blog address
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