// Hide prices
add_action('after_setup_theme','magik_activate_filter') ;

function magik_activate_filter()
{
   add_filter('woocommerce_get_price_html', 'magik_show_price_logged');
}

function magik_show_price_logged($price)
{
   if(is_user_logged_in() )
   {
      return $price;
   }
   else
  {
     remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_price', 10 );
     remove_action( 'woocommerce_after_shop_loop_item_title', 'woocommerce_template_loop_price', 10 );
     return '<a href="' . get_permalink(woocommerce_get_page_id('myaccount')) . '">Login to order</a>';
  }
}

//Option Two (If you decided to use Option One then don't add the following code)
add_filter('woocommerce_is_purchasable', 'my_woocommerce_is_purchasable', 10, 2);
function my_woocommerce_is_purchasable($is_purchasable, $product) {

	$isLoggedIn = is_user_logged_in();
	if(true == $isLoggedIn){
		//Make product purchasable to logged in user
		return true;
	}

	//Make product not purchasable to unlogged in user
	return false;
}