May be helpful for some members looking to get discounted Telstra data. These have been discounted to varying degrees in the past. Hope you find it useful.
Doesn't seem to be a limit on how many you can buy.
Description from page below:
Get your tablet online with the Telstra Telstra $30 Pre-Paid SIM Starter Kit for Tablets.
The $30 recharge Starter Kit gives you 2GB of days allowance to use within 30 days, ideal if you’re a regularly online and want the freedom to recharge month to month.
If you recharge your credit before the credit expiry date, unused Recharge Amount credit rolls over.