The phrase "standalone purchase" means buying something separately or on its own, without needing to purchase any additional items or services. Full definition
The packs will be available as standalone purchases (¥ 1400 each), or you can buy them as a pack for a discount of ¥ 3000. (gamnesia.com)
As the very installment of DLC in the expensive Season Pass it's not a reassuring start, and as potential standalone purchase for fans looking for a little bit extra it's frankly not worth the effort of downloading. (wolfsgamingblog.com)
Capcom did mention that the outfit will be available for standalone purchase at $ 3.99 eventually, but no exact date was mentioned. (playstationlifestyle.net)