Getting product ID on catalog page

Shopify Partner
12 1 6

Hey all,

we're looking at various solutions involving the product ID on the catalog page. So far this is what we have found:

Product Page : meta field or product id is available on all themes.
Catalog Page : Product id is only available on Debut theme. It is not present in any other theme catalog page anywhere.
So given this, does anyone know or can help us reliably identify the Product ID on the catalog page for all themes, If not available in meta then maybe in some other element id or class, etc?
Thanks in advance for any help or direction.