In addition to the cheap PlayStation Plus subscriptions that dropped earlier this week, The Good Guys now has 10% off all PlayStation Store cards.
You just need to add one of the below cards to your cart and then use the code JUNE10. These are digital codes that will be delivered VIA email.
These cards can be used on both the PS5 and PS4 and can technically be used towards PlayStation Plus subscriptions on the PlayStation Store too.
Thanks to OzBargain for pointing this out.