IGN's digital distribution service Direct2Drive has Metro 2033 (PC) on sale for 9.95USD, or 9.40AUD after the currency conversion.
I know this has being on sale for 5 dollars at Gamersgate before, but this is an opportunity for people to get it cheap regardless.
The must and has to register on Steam in order to play. Operate under the assumption that this is a 24 sale.
Good Deal i got this during Steams last Xmas sale for $12.50.
Also the GFX are the best, but you really need a powerful PC to play it with everything up high.