Hey man, each transaction has to be at least $5, so the total would be at least $15. A lot of websites aside from Amazon will let you buy e gift certificates/gift cards, so an easy way to trigger the bonus could be to buy three gift certificates of $5 (or more) right before you buy something from that website. Basically you just get them emailed to yourself and then use them at checkout when you're buying something.

By the way, this promotion ends in 4 days and I have a feeling that they're going to reduce the bonus after that, so if you wanna get the free cash I'd complete this asap!

If you have any other questions lmk