Have you seen the prices for new releases? I picked up Rage Anarchy Edition today for $64. 3000 Microsoft Points for $43 (although, 1500 MSP is selling for $19, so I kinda got jipped).
Modern Warfare 3 pre-order is less than $80, which is quite surprising given the fact that HN rarely offer games for less than $100.
So what I'm getting at is that Harvey Norman has become somewhat of a competitor in the video games department. Heck, they are even offering an Xbox 360 bundle about $60 cheaper than other retailers, which isn't really unusual, given that HN have done similar things like this.