Amex cardholders: Google Home (effectively) for $35 (with $20 off $50 Amex offer and $25 WalMart Gift Card)

American express has an offer for Google Shopping Express:
Spend $50 or more, get $20 back
Add the offer to your card.
Then, use the link below to order the Google Home for $80 and get a $25 WalMart gift card:
https://express.google.com/about/express25/
Delivery is free.
Final tally:
Google Home (discounted): $80
Walmart Card: $25
Amex Offer: $20
Final cost: $35