Cheapest new price I've seen for the Pocket Wifi 2. It's the only-just-superseded one, locked to Vodafone, covers 850/900/2100 MHz, ie all the 3G carriers, once it's unlocked. Comes with 3GB data, 30 day expiry.
These are really useful broadband modems. The battery's good for at least 5 hours, the modem's easy to set up, and best of all - it's easily unlocked. Unlock codes cost $3 and up: http://bit.ly/RSRC02 ($3.03) Check to see if you can unlock it free on the Vodafone site.
In-store only, NOT online. It's pot luck if your local DSE shop has one in stock.
Cheapest is has been yet.