I'm building a catalog of publications for a Research Center with DukaPress plugin.
Some publications are available for order, others are just downloaded for free and some are available through the publishers (we just provide a link to them).
I see that when there is no price defined, the product does not appear in the grid display. I need the latter two types of publications to appear even with no price, and without the “Add to cart” button. Does anyone know where can I hack this? Or, what can be my best solution here? Thank you