The Deal Spend $75+ in one or more transactions at GiftTree & get $15 back with an Amex Offer. Key Terms Expires July 31, 2020. Offer valid online only at gifttree.com. Tips & Ideas GiftTree sells physical gift cards online and it looks like they process the payments for those themselves which would mean it should trigger the Amex Offer. There … [Read more...] about (EXPIRED) GiftTree Amex Offer: Spend $75 & Get $15 Back (Buy Physical Gift Cards)