You might want to try calling your local Apple Store, reseller, or the 1-800 number and asking them.
First though...you should have received a copy of xCode on disc with your computer or OS package. You might want to look again to make sure you didn't miss it. I bought the full install version (DVD) for my iBook and xCode is on the DVD with the OS. You just have to manually install it from a directory off the disc.