Where to buy a new battery from!?

Hi guys...

 

I have a MacBook Pro 13" Mid-2009, Model # A1278

 

I need to buy a new battery for it...

 

Which online store offers that kind of battery? And I want to buy the original, not a fake or anything else!

 

I am abroad and a friend of mine offered to buy it for me in the states...

 

Any help??

 

S.

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