As a frequent bargain hunter, I can recommend an excellent website/forum call ozbargain where people post deals that sometimes can give absurdly cheap deals. For example, a while ago, Dicksmith had 14% off macbooks as opposed to 10% off.
only received 14 upvotes which means this is an extremely mediocre deal and also is a sony which is a premium brand but you get the point
Heres an example with more upvotes just as a guide of how cheap things are and the things are usually delivered so no need on wasting petrol and time driving to stores etc
Kogan sells grey imports meaning which means that there may be downsides in terms of warranty and if you keep an eye out, usually you can get a similar or usually cheaper price by buying locally.
