OEM Replacement ASUS power adapters can be someone expensive. They can range from $60-$100 direct from the manufacture. Amazon, is a good alternative for getting such adapters. If you need help finding the right adapter for you, please let us know and we can update our list.
65 watt adapters
Asus A54C Power Adapter – http://amzn.to/29niFlk
ASUS K55a Power Adapter – http://amzn.to/29ilGVG