Snippet to set price of items in WooCommerce cart

set-cart-items-price.php

<?php

add_action( 'woocommerce_before_calculate_totals', 'custom_cart_price' );
function custom_cart_price( $cart_object ) {
	if ( is_admin() && ! defined( 'DOING_AJAX' ) )
		return;

	foreach ( $cart_object->get_cart() as $key => $value ) {
		
		// CHANGE PRICE FOR ALL CART ITEMS TO 10
		$value['data']->set_price( 10 ); 
		
		// CHANGE PRICE FOR PRODUCT ID 55 TO 10
		if ( $value['product_id'] == 55 ){ // Replace with your own product id
				$value['data']->set_price( 10 );
		}
		
		// CHANGE PRICE FOR PRODUCT IN CATEGORY ID 25
		if ( in_array( 25, $value['data']->get_category_ids() ) ){ // Replace with your own category id
				$value['data']->set_price( 10 );
		}
		
		// CHANGE PRICE TO 10 IF QUANTITY IS MORE THAN 5
		if ( $value['quantity'] > 5 ){ // Replace with your own condition
				$value['data']->set_price( 10 );
		}
		
		// CHANGE PRICE IF PRODUCT PRICE IS ABOVE 100
		if ( WC()->cart->get_product_price( $value['data'] ) > 100 ){ // Replace with your own price
				$value['data']->set_price( 10 );
		}
		
		// CHANGE PRICE TO 10 FOR ITEM THAT HAS CUSTOM META
		if ( isset( $value['custom_meta'] ) ) { // Replace with your own custom meta
				$value['data']->set_price( 10 );
		}
	}
}

?>