-The easiest way to build store points quickly is to go to the high point challenge in freestyle mode. While driving, try to pull of as many backflip combos as you can on every jump. Once the round is complete, you will receive half the stunt score in store points, sometimes even getting 100,000 store points in only a one minute run. The dirtbikes are slightly easier to accomplish this with.
-To get fast and easy store points, go to single player mode. Play freestyle mode for about ten minutes to have about 1 million store points.