Hi Cliff, we have carefully investigate the underlying issues. Turns out Walmart group similar products (they think) together. Thus the data from Walmart isn't clean.

To help rectify this, we have added muliple_options_available attribute. When it is set to true, you can make a new request to serpapi_product_page_url to get more accurate seller info.

Hope this updates is helpful to you. Feel free to reach out if you have more questions. Thanks!