Amazon has a 20% discount offer that I have covered in the past. It’s a targeted offer, only available to Amex cardholders, who use at least one Membership Rewards point for their purchase. You can save as much as $100. For some people, myself included, it is even working a second time. Now the same offer is available with promo code AMEXSWP20PD, that could make it available to even more people that couldn’t get it to work before.
You still need to have a linked Membership Rewards earning card and use at least one point for your purchase. It works on items sold by Amazon only, gift cards included.
Another opportunity to get up to $100 off on your Amazon shopping if you weren’t able to get the offer to work.