Show price only to Registered Users

functions.php

add_filter( 'woocommerce_get_price_html', 'show_price_only_to_registered_users', PHP_INT_MAX );

function show_price_only_to_registered_users( $price ) {
	if( ! is_user_logged_in() ){
		return __( 'Please register to view prices', 'theme_name' );
	} else {
		return $price;
	}
}