The starting price is $2.2m, though optional extras including a sonar station, guided missiles, a weapon workshop, and built in Sparrow helicopter and Kraken Avisa minisub can take the total cost up to $9.8m if you select everything.
The main new vehicle available with the GTA Online Cayo Perico Heist update is of course the Kosatka submarine, available from Warstock Cache and Carry. If you can't find your submarine on the map, check the Interaction Menu > Services > Kosatka > Request Kosatka option to make sure it isn't currently in storage. How do you spawn the submarine in GTA 5 Xbox one Spawns a Kraken submarine, but only after completing the Wildlife Photography Challenge. When you reach the coast, you can use the Interaction Menu > Services > Kosatka > Request Dinghy option to spawn a boat nearby to get you out to the sub. Unfortunately as there are no living quarters aboard the sub, you can't use the spawn option to fast travel there so you'll have to get there the old-fashioned way.
The following vehicles are known to spawn at the locations described below. Decorated (50 points): GTA Online: Earn 30 Platinum Awards. The Submarine in GTA 5 is a one person vehicle which automatically equips you with a diving suit upon entering it, allowing you to further explore the depths when leaving the Submersible. Crew Cut (5 points): GTA Online: Complete a Job as a member of a Crew. Clean Sweep (10 points): GTA Online: Finish a Gang Attack without dying and kill at least 10 enemies.
Once you own the Kosatka, you'll need to head out to your submarine to start the planning phase of the GTA Online Cayo Perico Heist. From the GTA Online menu screen, if you go to 'Options,' 'Spawn Location,' and then 'Last Location,' you can go from lobby to lobby until the car you want spawns. Backseat Driver (10 points): GTA Online: Direct a driver to 1st place as co-driver in Rally Mode. After that, you'll need to purchase the Kosatka submarine HQ from Warstock Cache and Carry, which will serve as your base of operations for planning and executing the new heist and can be decked out with various upgrades including the GTA Online sonar station. There you'll meet Miguel Madrazo, son of Martin Madrazo, who fills you in on his plan to stage a heist on Cayo Perico and recover incriminating evidence about his family. To get started on the GTA Online Cayo Perico Heist, you need to head to The Music Locker, the new nightclub that's opened under The Diamond Casino.