I MUST know the amount of RAM in the iPad before buying. What are my options? [closed]
There is an app on the App Store named MacTracker. This app lists info about Macs, iPad and other mac devices. This may also exist as a web site as you mentioned before. The information in Mac Tracker is as accurate as any other site other than Apple itself.
You can also lookup the specs of iPad models on https://everymac.com/systems/apple/ipad/index-ipad-specs.html.