Hide Price for Specific Product CSS

Hello,

Please try to add the code below in the functions.php file in your child theme.

add_filter( 'woocommerce_get_price_html', 'hide_price_product_ids', 10, 2 ); 
function hide_price_product_ids( $price, $product ) {
    $hide_for_products = array( 29773, 29776 );
    if ( in_array( $product->get_id(), $hide_for_products ) ) {
        return '';
    } else { 
        return $price; // Return price for all the other products 
    }
}

Change the Product IDs 29773, 2976 with your own.

Best Regards.