From a reader

I got this feedback on a post I made earlier about Amazon.com's A9 search engine:

"My mom got a $2 credit off her last Amazon order for using A9. I wasn't aware she knew anything about it. I'm still puzzled. Unless they gave her a $2 credit so she would go check it out. I don't think she did. I did check it out."

I am not sure how she got the credit. Looks like you might need to experiment!