If you look at Andrews site, Trolley Cash from the UK will give a 2% cash back for Amazon and in reading the fine print is good for anyone worldwide. Maybe a conga opp.
Also for Ebay mentioned above, Bondrewards gives in savings bonds 39% of the sellers fees. I have cashed out $150 in savings bonds in a year from them.

I never buy anything without checking rewardsdb and Pgarys site.
Miles, points and FT Rocks!

JudyJFLA