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$20 off $100 Spend at Kogan.com @ Plus Rewards (Membership Required) - $4 for first four weeks
You can only use Plus rewards or Extra 6% off with gift cards - Saving will be better with gift cards on the 486GB
Kogan Mobile Prepaid Voucher Code: EXTRA LARGE (365 Days | 40GB Per 30 Days)
You can also spend a bit more with discounted gift cards on 486GB plan and get $100 Kogan credit.
I haven't confirmed if gift cards can be used to pay for this but Plus rewards credit works. They can not be combined.
How long does porting in a number usually take? I just started it two days ago and I'm still on my old Boost Mobile service.