This site has a lot of cheap CDs with free delivery worldwide. For example, HIM's 'Deep Shadows and Brilliant Highlights" is $3.76 AUS including delivery.
Probably you find find the latest chart toppers dirt cheap but many classics such as Nina Simone, Marvin Gaye, Pavarotti as well as DMX, Kylie Minogue, Sugababes, Bob Marley, Van Morrison etc. are really cheap. Just click on Bargain basement on the left of the website.
In my experience postage was quick and goods were in mint condition.
Occasionally they have cheap console and PC games, too. Maybe worth checking.
Have fun.
Can't find anything I searched for. They don't seem to have a massive range of stuff. Some okay prices on CD's though. My mum is the only person I know who uses CD's anymore, and they don't have the Nickelback shudder album she wants. Oh well.
On another note… how exciting to randomly see HIM mentioned. One of my favourite bands. OzBargain; please don't hurt me.