This is a great website to track how well your book promotion is going by tracking your Amazon sales. And it's free. http://www.novelrank.com/
If you join author central on Amazon you can track your real sales in almost real time, rather than using these other sites that only provide estimates which are sometimes quite inaccurate.
I'll go take a look; you have to sort of find the right link to quit. It's a daft UI.
Back in a bit. . . Oh, it's much easier now:
1. Log in to Amazon's Author Central
https://www.amazon.com/?tag=absowrit-20
2. Click the top navigation bar link for Sales Info