Mine is starting to bulge a bit. I was planning on waiting until it just died out but this is a bit scary. It doesn't feel hot or anything, but I don't want it to explode. Anyway, I'm sure the most expensive place to buy a battery from is directly from Apple, but are there any other places I should look? I am worried about buying a fake or 3rd party one. I was going to check the prices on Apple, but the store is down. Hopefully something exciting's coming soon!