I am off to Sydney on BA in December, and would like to buy a smallish laptop on my way there.

Can anyone tell me if there are good electronics stores in the terminal I am transiting through, and if there are any websites telling me which stores I should buy at?

I am particularly keen on any personal recommendations of good stores, and impressions as to whether prices are very cheap, or if I am better buying it either back in the UK or in the USA?

Any tips/hints gratefully appreciated.