I’m fairly sure that the price information shown on a Google Search result page is advertising that comes from a different source than the results do.
As far as I know, you could write a plugin for SearXNG to query suppliers and format the output as required.
I think that Google Shopping might be queried in the same way, but I’ve never looked into it deeply.
Not sure how I feel about such a bot. I can see potential security issues arising in relation to stored relationships between users and posts.