These were recently on sale for $9 but the deal is expired. I just saw them advertised for $9 at Glendale (NSW) Coles. I bought one (it scanned at $9 so doesn't seem to be an old/expired advertisement). Activated it and am using the 3GB data as we speak.
Not sure if it is nation wide. Coles website states they are $19.
A good deal just for the data at $3/GB. Time to stock up if you can find at this price.
Previous deal
Coles broadband device prices shows $19
I previously bought a stack of these as there is effectively no expiry date, just 30 days to use 3GB. Just insert next SIM when it expires. SIM operates on 4G, but modem is 3G+, which is fast enough for most uses. Device is unlocked.
Stores usually limit sale to 1 per customer, but may sell more or allow multiple single purchases. May ask for ID.
I use the SIM in a Pocket WiFi or 4G phone on data only.
Make sure your area has good reception & speeds. For my Brisbane location, speed seems as good on 3G+ as Telstra 4G.