Not the lowest ($252) but it hasn't been down that low for about 15 months, and generally this has been the lowest with 20% off deals. Original Coupon Deal Mod: 2TB $545 (Thanks pn09)
One day special (31/7) so it will expire some time next morning. Great for those who impulse bought a macbook air from the kogan deal and wished they've bought a 256GB version instead.