Magento frontend product view page i need to set custom final price,

how to set? I tried Magento\Catalog\Model\Product\Type\Price.php in this file getFinalprice function but not working with plugin

can anyone give suggestion

  • what you want when customer trying to add product to cart then during this a custom price should be set? Oct 3, 2018 at 11:30
  • no, when i open product need to display my custom price i am calculating price with some extra amount if min sale qty is less than 5 i need to display my custom price like price * my extra fee
    – Pawankumar
    Oct 3, 2018 at 11:45

2 Answers 2


The class you're looking for is Magento\Catalog\Pricing\Price\FinalPrice

The below code will double the final price as an example:


<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    <type name="Magento\Catalog\Pricing\Price\FinalPrice">
        <plugin name="vendorname_modulename_catalog_pricing_price_finalprice" type="VendorName\ModuleName\Plugin\FinalPrice" />



namespace VendorName\ModuleName\Plugin;

class FinalPrice
     * @param \Magento\Catalog\Pricing\Price\FinalPrice $subject
     * @param float $result
     * @return float
    public function afterGetValue(\Magento\Catalog\Pricing\Price\FinalPrice $subject, $result)
        return $result * 2;
  • here the problem is i am unable to get product data
    – Pawankumar
    Oct 3, 2018 at 12:27
  • You can do $subject->getProduct() to get the product data Oct 3, 2018 at 13:11

If you want to use event observer for the price change on the product page. You may use following event


and in the observer you may use following code.

public function execute(Observer $observer)
    $customPrice = 4;
    $product = $observer->getEvent()->getProduct();

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