So a friend who is an ex-Vodafone employee knew the cheapest way to get internet via mobile.
To setup you need a 4G/3G compatible phone or mobile modem. Then purchase a $1 prepaid sim card and recharge with credit. The cheapest option for credit is the $20 Starter pack. After that, all you need to do is purchase $3 for 2GB Data add-on whenever you need data. If you want to use it with a mobile modem you just purchase the modem separately from any plan and use it with the pre-paid sim card.
This is not a deal but is part of Vodafone's prepaid service and is essentially the cheapest way I know of to get large amounts data on a mobile device.
There could possibly be cheaper options by other providers, so please say if there is something cheaper or has better value.
Important Information
The drawback of this is that Data expires after 24hrs and you forfeit whatever you don't use in that time frame. Also, when I went to add-data for the first time, there was no option for the $3 add-on. I spoke to a Vodafone manager over the phone and they just added in the option because of an error of it not appearing for the $20 recharge. If you contact over phone you have to ask for the manager because a regular employee does not know about why the $3 option does not appear. Basically the reason is that no one knows about this, not even many Vodafone employees and since it's not part of Vodafone's mobile broadband offers they don't expect anyone to use large amounts of data on a different plan.
Awww c'mon now, is this a deal?