On category page products that have prices below 10$ in magento2

Create the Custom Module:

Create a custom module in your Magento 2 installation. Let's call it Custom_Catalog. You'll need to create the necessary module structure with files and folders:

app/code/Low/Price/registration.php

app/code/Low/Price/etc/module.xml

Declare the Module:

In registration.php, register your module:

<?php

use Magento\Framework\Component\ComponentRegistrar;

ComponentRegistrar::register(ComponentRegistrar::MODULE, 'Custom_Catalog', __DIR__);

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Module Configuration:

In etc/module.xml, define your module:

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">

    <module name="Custom_Catalog" setup_version="1.0.0"/>

</config>

Create the Observer:

In your custom module, create an observer to modify the product collection on category pages. Let's call it PriceFilterObserver.

File: app/code/Low/Price/Observer/CatalogProductListCollectionObserver.php

<?php

declare(strict_types=1);

namespace Low\Price\Observer;

use Magento\Framework\Event\Observer as EventObserver;

use Magento\Framework\Event\ObserverInterface;

/**

 *COMMENT

 */

class CatalogProductListCollectionObserver implements ObserverInterface

{

    /**

     * @param EventObserver $observer

     * @return $this|void

     */

    public function execute(EventObserver $observer)

    {

        $productCollection = $observer->getEvent()->getCollection();

        $productCollection->addAttributeToFilter('price', ['lteq' => 10]);

        return $this;

    }

}

Declare the Observer:

Create a file app/code/Low/Price/etc/events.xml to declare the observer:

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">

<event name="catalog_block_product_list_collection">

<observer name="vendor_product_list_filter" instance="Simple\Lowprice\Observer\CatalogProductListCollectionObserver"/>

</event>

</config>

Enable the Module:

Enable the module and clear the cache as explained in the previous example:

php bin/magento module:enable Low_Price

php bin/magento setup:upgrade

php bin/magento cache:clean

After implementing these steps, the observer will be triggered whenever the product collection is loaded on a category page. It will modify the collection to include only products with prices below or equal to $10.