WooCommerce - Different prices for users

gistfile1.txt

<?php
/**
 * Plugin Name: WC Price
 * Plugin URI: http://localhost
 * Description: WC set different prices
 * Version: 1.0
 * Author: kso
 * Requires at least: 4.1
 * Tested up to: 4.3
 *
 * Text Domain: whatever
 */
// http://stackoverflow.com/questions/15090258/woocommerce-custom-price-using-get-price-function
function return_custom_price($price, $product) {
    global $post, $woocommerce;
    $post_id = $post->ID;
    // Prevent conflicts with order pages and products, peace of mind.
    if($post_id == '9' || $post_id == '10' || $post_id == '17' || $post_id == '53' || $post_id == ''){
        // cart, checkout, , order received, order now
        $post_id = $product->id;
    }

    if(! is_user_logged_in()){
        $new_price = $price;
    }
    else {
        //
        $new_price = '10';
    }

    if( is_admin() && $_GET['post_type']=='product' ){
        return $price;
    } else {
        return $new_price;
    }
}
add_filter('woocommerce_get_price', 'return_custom_price', $product, 2);