Can i delete a Battle.net account

• Game keys cannot be attached to two battle.net accounts. (trying to do so gives a message saying that that key is already in use)
• Game keys cannot be unregistered or transferred by any user options. (The interface has nothing of the sort)

If this needs to be done, you'd have to contact Blizzard customer support, but I'm not sure they'll let you. They might though.

Update:

After re-reading through the TOS, there are two separate "licenses" involved (from a legal perspective), the license to use the game client, and the account to play with. The account cannot be sold. The client can be transferred, but the new owner would have to purchase a new account, that is supposedly available at blizzard.com or battle.net

(I am not a lawyer, my advice is not legal advice)

You would have to change your "COUNTRY OF RESIDENCE" option on battle.net unfortunately it can only be done if you contact blizzard support and make up some good story why you need it to be changed.Note that doing this could cause you bunch of new problems.

Other thing you could do is order retail copy online from Amazon or any other sites if you manage to find it cheaper,most of the sites have a pre-order discount if you order before game release so you could pass even cheaper,the problem here is you will have to make sure that shipping & border control won't charge you sin you could end up paying even more.