Disclaimer: I have not used this site before but it appears to be legit
1. Register with TopCashBack using the link in the article above.
2. Use TopCashBack's link for 3% cashback to get to the Amazon Echo page on Amazon.
3. Purchase device.
4. Wait approx 1 week to be awarded the cashback.
5. *Apparently* you then just transfer the money to your bank account.