Macbook Pro, Service Battery

[mcooke]

I'm wondering if anyone knows the cheapest way to get a good battery for my macbook?
According to CoconutBattery it's running at 36%, and is getting lower and lower everyday. I need to buy a new battery and my MacBook is no longer under warranty..... I've looked around on the apple website but every time i try to find something that isn't brand new, I cannot find it!
So, if anyone knows what I should do, or knows how I can fix this terrible problem Pleeeeaaaaassssseeee let me know.. I have to have it plugged in 24/7 (or shut down obviously), or the battery goes from 100% to "Please connect to charger" in like 20 minutes! as you can see this is frustrating.

 

[Macman45]

Available from Apple here:
http://store.apple.com/us/product/MB772LL/A

Don't buy third party knock offs.

 

[And1ss]

Go official. Most of these "battery replacement' posts on MR will always conclude that it is best to go official and not buy third party.

 

[mcooke]

I don't want to buy a third party, I only go apple. They're just so expensive in the apple store!

 

[Macman45]

I don't want to buy a third party, I only go apple. They're just so expensive in the apple store!

Use the link I posted, they will things out for you