Budget telco Vaya has today launched what it calls "wallet-friendly" data-only plans, ranging from 5GB for $15 to 70GB for $65, hosted on Optus' 4G Plus Network.
As well as the 5GB and 70GB plans, there are also $35 15GB and $55 50GB plans on offer. They can't be used for businesses, and there's a standard "fair use" policy that applies. Since the plans are data-only, that means no calls or SMS are included at all.
The plans are month-to-month, no lock-in contracts and Vaya offers a "Price Beat Guarantee", which basically means they will price match any other telco's comparable 4G non-promotional offer, as well as provide the next month for free.
You can find out more here.