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"Get 8GB total data (4GB included and 4GB bonus) to use in Oz when you buy our $5 Daily Data Add-on from Friday to Sunday. Offer ends 30/06/20. T&C apply."
Also,
"Get 4GB total data (2GB included and 2GB bonus) to use in Oz when you buy our $7 Weekly Data Add-on from Friday to Sunday. Offer ends 30/06/20. T&C apply."
The bonus data deal is not shown on the linked page, but when you logged into Myvodafone and select data add on it comes up.
Meanwhile on Amaysim: "Hey XXX, It's an at-home Easter, so we've given you 200GB bonus mobile data for this long weekend".