nathan: a system error causing a pricing mistake. case closed.
7. CANCELLATION OF ORDERS
7.1 JB Hi-Fi reserves the right to cancel, at any time before delivery and for whatever reason, an Order that it has previously accepted. JB Hi-Fi may do this for example, but without limitation, where:
(c) Goods ordered were subject to an error on the Website, for example, in relation to a description, price or image, which was not discovered prior to the Order being accepted;
The way I see the order has been accepted once the credit card has been charged, I would agree that either party could cancel the order before the payment was authorised.
And at the end of the day a company cannot contract out of the law, doesn't really matter what the T&C's are, if they don't align with the law they don't apply.