I think I've found a way to get the PS4 pro with Spiderman for $399 for those with the Sony store amex offer saved.
Sony store has it out for $489.95 and I have an amex offer for spend $300 get $50 back. Cashrewards have 9% cashback on Sony site.
So by my reasoning that's $489.95 - $50 = $439.95 and then cashback on the pre GST amount knocks an extra $40 off so all up roughly $399.95.
Can anyone see anything wrong with my logic?
I've never used Amex before, but I'm unsure if you can use multiple offers at once (I think Amex might go through but cashback will refuse the 9% or well technically Sony would I think?)