Is there a way to make sure all the products have a compare at price zeroed out without having to check each of their prices individually?
You can use the bulk editor if you don’t have to many products. just click add field and then Compare at price.
I have a few thousand so I use ABLESTAR Bulk Product Editor. It is free for up to 5 uses per month. When it asks you to search for products, leave it blank and it will choose all. Then Modify and choose Compare at Price from the dropdown menu,