I am using the eBay developer APIs to scrape some books via the findItemsByProduct endpoint:
https://developer.ebay.com/devzone/finding/CallRef/findItemsByProduct.html
The only problem I am facing is that the response I receive does not tell me if the product is actually available or not.
E.g. JSON response I get from searching 9781492286738 is similar to a different call via 9780486433981 but whilst the former is actually available for purchase once I click on the url link contained in the response, the latter is actually out of stock:
Is there a way to make possibly a different call to see if the item is available? I've seen the Inventory endpoints but my understanding is that not relevant to my case as I am trying to check not my listings.

I think you have to use
getItemAPI for each item to get inventory