Back during NBA 2K14, VC Points were given out for free by 2K. This practice has yet to expire as players on NBA 2K15 too are blessed with free VC Points. On the downside of things, the rewards given are considered as cheats and not from an official giveaway.
Regardless, you can start enjoying the extras in the game with the VC Points offered. They can simply head to Options> Features> Locker Codes and key in the following:
Keying in option 1 will bless players with 500 VC Points. As for option 2, it will add in 1000 VC Points. For option 3 and 4, it will reward the players with random items. Then there is option 5 that unlocks the ABA ball.
Of course, the points only work once so it is best to utilize this opportunity before the cheat expires. If players crave for more VC Points, they can complete achievements and tricks in the game.