Hi,
There is a product insert plugin in HikaShop which can allow you to add products "add to cart" buttons in joomla articles. As it's a standard editor plugin (it displays a "products" button below your HTML editor) it should hopefully also work in zoo content although I didn't try.
You can find more information on that here:
www.hikashop.com/en/forum/4-how-to/61813...ink-to-products.html