Price Comparison Portal without Store creation or onboarding

Dear fellows,
I need suggestions to create price comparison portal for any product but geographically locked. Don’t want to create stores on it but want portal to scan prices from existing online stores, same as news apps which scan multiple news sources and update portal and user can see news multiple sources.
Closest option I have seen so far is
If anyone can advise me on right theme/source available, I will be grateful