out of stock NetGear Aircard Smart Cradle (DC112A) $79 at Telstra
The next cheapest I have seen it is $225.
Boost your mobile broadband with one of these smart cradles. Better WiFi, Better Mobile Broadband. Connect Ethernet devices, external antennas or connect to your NBN Modem as a router.
Popular for those who can't get ADSL or NBN (since NBN seemed to have balls up the rollout) and have decided go Wireless Broadband and the Netgear AC800S with Optus. Just plug it in and you have a full fledged modem/router combination with ethernet ports.