Next now deliver to your door in Australia for just $7.50.
You only pay a $7.50 shipping charge for each order, regardless of how many items you order.
For returns, it states you have to pay your own returns cost.
Simply return any unused items within 28 days for a full refund (provided it is in a new, unused condition) via post using the returns label on the reverse of your delivery note. Postage must be paid by the sender and will not be refunded by Next Direct. (this does not affect your statutory rights).
If you want to clarify it I'd email Next direct and enquire. But it sounds pretty standard to me.