Simply ask Alexa to search for any product found within your local supermarket and a browser can automatically open showing the search results on a standard TV screen or PC monitor.
The command is looking for a trigger phrase e.g. ‘Search supermarket for’ and then anything that follows that phrase will be treated as the actual search parameter. So,
Search supermarket for red wine
Would activate the launching of the browser. You could also have a slightly different phrase e.g. ‘Search supermarkets for’ where several browsers all open up simultaneously and search several supermarkets for whatever you have asked.