SimPoint Card

SimPoint Cards ('or Sim Point Cards) is a Simulation version of money to buy items for your Sims on The Sims 3 Store. They are ranged from 1000 simpoints to 24,000 simpoints.

They Enrich item selection for the player and make you be able to get extra items like a nice T.V. to a Monstrous new car.

EA'S Classed version of it
Here is a scrip from Origin.UK:

Get EXCLUSIVE content for The Sims 3™ with 5000 SimPoints! Use your SimPoints to enrich and customise your game at The Sims 3 Store.Choose from hundreds of unique items and content sets that you won’t find anywhere else, and new items are added every month for your Sims. From hairstyles and outfits to furniture and architectural items, customise your Sim's appearance and houses in all-new ways. Shop at The Sims 3 Store by visiting http://gb.store.thesims3.com/ or through Shop Mode in your game. ** You must have The Sims™ 3 PC game to use the items purchased online with your SimPoints *The value of items may vary, visit The Sims™ 3 Store for more details.