There is more than one way to get those virtual currency but the easiest way to get them is to claim them using those locker codes. Here are some codes that you might want to try out now.
To get some extra VC points for the NBA 2K15, try using the codes SHOOT2MUCH500 and #2KTVPOSTSEASON. The first code will give players 500VC while the second code will give them 1000VC.
To get some free in-game item, try using the game #2KTVMELOGEAR, #AIRCRAFTCARRIER, RA9M5-EQZCF-2EYQQ-1F5AF-UEP51. The items dropped will be randomized.
The code PAYRESPECT can be used on both the NBA 2K15 and NBA 2K16. Using the code will allow the player to play the game using the ABA Ball. To redeem, go to Main Menu > Option > Features > Locker Codes and enter the locker codes.
Follow them on Twitter so that you can be the first to know about the other locker codes as well.