I know that you don't want to pay for an app, but our app has a reasonable price, and it meets your needs. You may want to check it. https://apps.shopify.com/merchbees-inventory-value
I just got Shopify. I switched from Shopkeep. I'm dumbfounded that inventory value isn't available without an app. I'm too far down the road to make a change but I want to put it out there that unless I'm missing something the practice of having a platform that doesn't do basic functions so that you are forced to add an app that costs additional seems sleazy. I'm going to export my inventory and convert to excel and see if I can calculate inventory value myself but at this very moment I'm more than disappointed in Shopify. I hope someone proves me wrong.