I created a new Bnet account just to research and answer this (and later, other similar questions on other threads).

Here's what I have gathered:

1. If your Bnet account's country is within SEA (in my case, I used Philippines), you DO NOT have the option to buy an SC2 account from sea.battle.net.  This means that Blizzard does not sell SEA accounts from Bnet anymore.

2. If you choose LA/KR/TW/EU as your game region, the Bnet website will allow you to purchase SC2WoL or the WoL/HotS bundle.

3. If you choose your game region as North America (or attempt to purchase from us.battle.net), SC2 is unavailable option. 

4. The Blizzard store will ship to the address you entered in your Bnet account.  Ground shipping (within US) takes 8 to 10 business days.  Expect 10 to 15 (or more) business days when shipped internationally.

5. Since the Blizzard store is based in the US (only), your SC2 purchase will be the NA version/region.  Even if you access the Blizzard store from the SEA website (sea.blizzard.com), it will redirect you to the US store (us.blizzard.com/store)
I could only offer a couple of ideas as to why we can't purchase the NA version (#3 above).

- it's a bug
- Blizzard is beginning the process of combining SEA and NA (similar to Diablo 3's Americas server) and will re-enable the option to purchase WoL once SEA and NA has been combined (in other words, global play).
There are a number of retail stores that still sell SEA accounts.  I know a couple in Midvalley Megamall and one in Sungei Wang, and I'm sure many stores in Lowyat and Digimall sell too.  And I'm sure, you will still get an NA account with the SEA box purchase.  Unfortunately, buying a new retail box will cost you at least RM170.

So what I am saying is, tough luck.  Until you see the SC2 option available on us.battle.net, you just can't do anything.  You could purchase WoL only or the WoL/HotS bundle from the LA/KR/TW/EU region though.  If you don't mind waiting until global play becomes live, then that is your best option.

You could also try to call Blizzard customer support.

yes.
A lot of store at malaysia still sell WOL the box version rm169
Heavyarm also still have just went to that shop recently

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Added on November 24, 2012, 4:30 pm
GoodJob
was trying to buy the cheap NA account but cant.

Mv is ?
i know gh but not mv

I'm having the same problem as you are except that I have already loaded $20 of balance to purchase this game!!
Sadly, I'm also seeking a way around this as I don't want my money to be wasted. I should have checked before I load the balance.
If you guys know anything please share thanks