Show error message when adding a product of price 0.
To restrict products having price zero from shopping we need to create a observer on
checkout_cart_product_add_after event such that on every add to cart it will check the
product price and then add to cart.
Create a module and in etc/config.xml define the observer under event node.
Here Our module name is zeroprice under Letsknowit namespace.
File path : app/code/local/Letsknowit/zeroprice/etc/config.xml
singleton
zeroprice/observer
checkProductPrice
Now in Model folder we need to create observer with function name checkProductPrice.
File path : app/code/local/Letsknowit/zeroprice/Model/Observer.php
Class Letsknowit_Zeroprice_Model_Observer {
public function checkProductPrice(Varien_Event_Observer $observer) {
if ($observer->getProduct()->getFinalPrice() == 0) {
Mage::getSingleton('core/session')->addError('Sorry, you cannot purchase "'.$observer->getProduct()->getName().'" product.Write to us if any query!'));
$url = Mage::getModel('core/url')->getUrl('checkout/cart/index');
Mage::app()->getResponse()->setRedirect($url);
Mage::app()->getResponse()->sendResponse();
exit();
}
}
}
?>
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Clinton
10th January 2026
Great approach to handle zero-priced products! Just like in curve rush 2, where every move counts and you need to avoid pitfalls, ensuring that products with a price of zero don't make it to the cart is crucial for a smooth shopping experience. It's all about maintaining the right strategy, whether in gaming or e-commerce! Keep up the good work!
Luciana
8th December 2025
The implementation looks solid for preventing zero-priced products from being added to the cart, but ensure you test it thoroughly.
Luciana R.@NDIS Support Coordination
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