(Update: Added below XBOX, Playstation, and Roblox for 15% discount.)
Amazon offers 5% cashback for all Amazon purchases made on their Amazon and Synchrony credit cards for Prime members. Additionally, they offer periodically various specific products which get an extra 5% for 10% back total. Sometimes they’ll even offer 15% or 20% back on select products.
Interestingly, they are now offering the 10% cashback rate (5% + 5%) on various gift card brands, including:
You need to buy these exact cards and denominations to get the bonus (as reflected at checkout), but you can buy multiples of these and get the bonus on all the cards. These offers are valid through December 17th. These deals might stack with Shop With Points deals as well.
These deals are valid through January 1, 2022.
Source: doctorofcredit.com