Well that depends where you live. Any camera shops around your place? I use the LowePro 200 myself for my Nikon D200. Carries 3 others lenses, and room for a flash and other sundries and supplies. Do a Google on the LowePro 200 AW.
For good deals check out craigslist and ebay. I use a Naneu Pro backpack, are you looking for a case just for the camera or for the camera plus lenses and other accesories?
damn i keep forgetting this is an international forum! so that is a great website if yer in australia, they have stores in melbourne and brisbane aswell and do sent via post