HN have their 1/2 yearly sale on at the moment. Might still be on next week? Didn't look at computers and laptops specifically, but I remember seeing some of the prices on the fridges. Absolute bargains on some at the moment.
go see the good guys ramps. I just got a decent laptop for $430.
unless you are into gaming or messing about with video production you don't need to spend too much more.
JB hifi often have good deals too.
Harvey rarely comes close to these two.
JB if you're after a quick laptop bargain IMO. HN won't mark old lines down I don't think. Those sorts of shops would of been getting in the new laptops with gen 3 and ivy bridge CPUs, so they're probably cleaning out of gen1/2 and sandy bridge laptops. Should be able to score a laptop with a gen 1 i5, decent RAM, wifi and other bits and odds for under $600.