I have a 2.2 MBP. My battery is completely dead at 428 charge cycles, as in if the power chord gets unplugged my computer dies. I'm sure this is wrecking havoc on my harddrive. So I need a replacement. I know I can buy one from the apple store it just seems so over priced. Is there anywhere else I can gat a battery or do I just need to man up and buy from apple?