I have seen many replies recently in regards to online purchases for JB that there is a limit to the amount of gift cards one can use in a singular transaction.
While this used to be 5, it is no longer the case.
I recently purchased online with an amount that would exceed the 5 card limit of $2500 (5 x $500 e-gift cards). Before I purchased them all I looked over their website for the limit, it is not found. The New Zealand JB site says it has a limit of 5, but nothing for Aus. So I called their online help, and they said there is no longer any limit, it was removed some time ago.
I put this to the test, and as you can see in the screen shot, 10 gift cards were successfully used online to complete the transaction - https://i.imgur.com/CC5UtBi.png
Good man 🙏