This same model, with less RAM, sells for $899 refurbished at the Apple Web site. It's a good deal, if you don't mind using a PowerPC processor.
http://www.Geeks.com/details.asp?invtid=IBOOK1-PB&cpc=HPM
http://www.Geeks.com/details.asp?invtid=IBOOK1-PB&cpc=HPM