First off, what PowerBook G4 model do you have? There is a seller on ebay sellling brand new screens.. But in the meantime, here is a high resolution screen which I belive are universal to all 17 inch PowerBooks..
Also, stay away from "WeLoveMacs.com", they are a rip off and at most charge way too much for apple parts.
Here is the link for brand new screens:
Look up seller Leonworks2010 - I spoke with him personally and has every 17 inch screen for PB G4's.. New and never used.
Hope this helps..