Konami in Japan are selling standalone discs for the Metal Gear Online Starter Pack priced at 1,800 yen which is around $17.
MGO is free-to-play online so you can make your way to the mayhem without having to cough up your savings, expansions are coming too apparently.
From July additional content, DLC, will start to become available for Metal Gear Online adding ”new maps, new characters you can play as, new skills, and new modes”.
No news whether this will expand to the rest of the world yet.
Source: Silconera