A Rule for display the button cart

-- url of the page with the problem -- : www.egimotors.it/index.php/services-ricambi-egimotors
-- HikaShop version -- : 3.3.0
-- Joomla version -- : 3.8.5

Hi, it's possible to create a rule:
if the price = 0 don't display the button add to cart

i can do it?
thanks in advance