A function to only compare certain stores and "turn-off" others.

A function to only compare certain stores and "turn-off" others within the setting options for users who create an account. I'm imagining using a toggle type button. Where I'm from, some store like Morrisons and Ocado aren't available. If the deal isn't available with any of the stores I've "turn-on", then the deal won't show on the homepage or in the search.