public function get_ending_sales() {
		global $wpdb;

		// phpcs:ignore WordPress.VIP.DirectDatabaseQuery.DirectQuery
		return $wpdb->get_col(
			$wpdb->prepare(
				"SELECT postmeta.post_id FROM {$wpdb->postmeta} as postmeta
				LEFT JOIN {$wpdb->postmeta} as postmeta_2 ON postmeta.post_id = postmeta_2.post_id
				LEFT JOIN {$wpdb->postmeta} as postmeta_3 ON postmeta.post_id = postmeta_3.post_id
				WHERE postmeta.meta_key = '_sale_price_dates_to'
					AND postmeta_2.meta_key = '_price'
					AND postmeta_3.meta_key = '_regular_price'
					AND postmeta.meta_value > 0
					AND postmeta.meta_value < %s
					AND postmeta_2.meta_value != postmeta_3.meta_value",
				time()
			)
		);
	}