FYI,

http://www.ebay.com/itm/Apple-PowerBook-G4-17-Laptop-M9970LL-A-October-2005-/251158759256?pt=Apple_Laptops&hash=item3a7a3a8758

If you think you can do your own key replacement/repair on the PowerBook keyboard, this might be won at a good price, too early in auction to tell.

It also needs a new battery, but most laptops this age need new batteries and you can still get new ones at reasonable prices.