As Owen mentioned it works out around $5 per package of a single/few cards.
Given the rather steep and dramatic postage increases to Aus recently, and the fact a lot of US
sellers have free postage I still think its pretty good alternative. I usually get upto my 20 packages,
or a month and then ship the lot (after 30 days of storage you have to pay to continue them to hold it).
Ive had 2 packages go awol out of over 100 so not too bad, the ones that went amiss were easily replaceable
and not expensive luckily.
Just need to be wary that with the live chat, Ive typically done it around this time of night, equals the dead of night in the
US so while they say they can check on things its not till the warehouse opens later that morning...