How much does it cost to get my iPod Touch 3g's batteries replaced at the Apple Store?

I think my iPod Touch's batteries are dead. No matter what I do it doesnt turn on. I plugged it back to my computer and iTunes can't even detect it. So the most logical explanation is MY IPOD IS DEAD! I have had it for almost 2 years now and I didn't buy the expanded warrenty... 

Please tell me how much it cost.. and don't say, "Get the iPod Touch 4!" I'm perfectly fine with the 3rd gen..

Thanks in advance. 

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