I got it off ebay, they are cheapest there by far but you do have to wait, since they are usually shipped from china or they say they are.
iBook G3 OS X 10.4.8 / Ubuntu Dapper Drake 6.0
Mac Mini Intel Core Solo 1.5 GHz OS X 10.4.8 / Vista RC1 (testing)
Coming Soon: Mac Mini G4 1.42 OS X Server 10.4.8