SHOPEOFY10
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Saw this deal on Shopback who are also offering 10% cashback that can be stacked.
Should be able to also stack with the AMEX offer (thanks forumninja).
I don't have anything in mind to buy, but staking all deals should mean that you should end up paying about $525 for an item worth $833.
$833.33 (less 10%)-> $750 (less 10% cashback) -> $675 (less $150 Amex cashback) -> $525.
Probably not gonna buy anything, but have a +.