The only thing that turns me off Liquidation.com - and this is from the point of view of an international - is the $300 minimum shipping cost to Australia plus $150 for 'document clearance' on top of it. That's $450 on top of whatever you buy if you're an Aussie. Under those conditions, you'd hardly make a profit....
I know there are places that will give you a local US address and then ship it out at a lower cost, but they cost $14.95 just to maintain the address (plus the shipping on top of it) or thereabouts a month, so you'd have to be certain that you're going to be ordering stacks of stuff on a regular basis.
Not cheap for this part of the world.....