How much exactly will be the cost in case i want to register a *.com domain with wordpress for my wordpress.com blog? do i need to upgrade for that? after registering a domain with wp….will it be redirected to my blog without any additional procedure or i have to map it by paying additionally?
Domain Registration is a paid upgrade that costs $18.00 per domain ($25.00 for .me domains), per blog, per year, and it includes mapping to your blog. For $8.00 more, you can also make the domain registration private.
If you own a domain already ( for example, from GoDaddy or Namecheap ) you will only have to pay $13 to map to your WordPress.com blog.
I am sure you saw this, but here is a link with additional information: