Try classifieds at singnet.I think the ibooks there are about 1-2 hundred dollars cheaper for the same model. But think carefully b4 you commit to a mac ( if you are a PC user that is), many people end up selling them because they thought it works like a pc. Go down to computer expo this weekend and check out teh apple booth..and test if you like the feel of apple skin.
This is my own opinion, if you do ONLY digital photo manipulation, G3 500/600 is enough.Just pump in more rams if you use photoshop. Its perfect for digital photos.. thanks to iphoto.. a very simple to use feature packed app that comes with OS X.