Hi Karl,
There is no minimum order quantity, as long as it's a standard blue i-PT it's $65US each. For Australia the price works out at $87AUD each and $16AUD postage. You don't have to pre-pay, we will email you when your order is ready and you can then pay by PayPal. You can pay by US$ through PayPal, $65US plus $13US shipping back to you in Australia.