Products, Buying Options, Categories, Recommendations, Stores and Commerce.
Best Buy API is a free Shopping API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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Yes. The Best Buy API is listed in the Shopping category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Best Buy API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Best Buy API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Best Buy API is served over HTTPS, so it's safe to use in production.