https://www.cnet.com/how-to/this-is-your-secret-weapon-for-amazon-prime-day-deals/
This is your secret weapon for Amazon Prime Day deals
The simple Amazon Assistant tool for Chrome, Firefox and Safari does triple duty.

Are you really, really ready for the flood of deals coming over the Amazon Prime Day? You will be once you install the Amazon Assistant browser extension, which can track Prime Day deals over the two-day event that runs 48 hours from Monday, July 15, through Tuesday, July 16. You can even get the deals without being a full-time Prime member.
This free tool, from Amazon itself, does three valuable things. First, it can alert you to deals you are following on Amazon. Second, it can show you how the Amazon price of a product compares to other sites’ prices, even if you’re looking in another online store. Third, you can use it to add items from other shopping sites to your Amazon Wish List in just a click.
It’s quick to add the Amazon Assistant browser extension to your browser. To get install, visit the browser extension page for Chrome, Safari and Firefox and then click the Add button to install the Amazon Assistant extension. It’ll appear as a button in your browser toolbar.