This FREE extension will turn all of your zero priced products into a phrase defined in xml and customers can inquire about the product. Once installed, all products that display a price of zero will display a phrase you define in the xml section of the mod - 'Available for request' by default. Also the button to add to the cart is renamed to 'Request price'.

You can contact us at http://www.osysltd.com or http://vsprose.ru

This mod has been successfully tested for a standard OpenCart 2.0.x.
Don't use other Opencart versions with this module.