[houltmac]

Finding one could be tough, especially for MacBooks. Firstly you have to consider that they are all still in warranty and won't be dismantled too quickly. Secondly you have to remember that there is no way to sell just the keyboard as such, the entire top case needs to be sold and fitted which is far more expensive and difficult.

PowerBooks would be a little easier, but you would need to know the exact model as there are tons of different keyboards and they don't all fit each PowerBook (PowerBook and MacBook Pro keyboards are not interchangeable). I can help you with this, but you would need a machine in mind to find a compatible keyboard or vice versa.