Purse.io already gives 5%-20% cashback when you buy something from Amazon.com.
Now for the month of June 2018, they're offering an additional $10 cashback if you use Bitcoin Cash.
Details from the Purse.io website:
To celebrate the addition of our second coin, we partnered with the Bitcoin Cash Fund to give cash back to users who shop or earn BCH in June 2018.
$10 Cash Back for Shoppers*
$850 in prizes for top Earners**
#cashback on Purse.io
Be sure to sign up for Purse.io so we can notify you as soon as Bitcoin Cash is live.
*Limited to first 1,000 users who make a purchase using BCH in June 2018. One Cash Back giveaway per person.
** Based on number of BCH orders successfully delivered in June 2018. 1st place: $500 2nd place: $250 3rd place: $100
https://blog.purse.io/from-one-to-two-bitcoin-cash-bad5ec8539f4