Instructions
Order your 800-point Microsoft Points card from an online electronics retailer such as Amazon.com, Buy.com and GameStop.com.
Go to Microsoft's XBox or Zune website to purchase points that will be added immediately to your account, freeing you from needing to wait for a card to arrive by mail.
Visit a major electronics retailer such as Best Buy and GameStop that sells Microsoft video game products and carries Microsoft Point cards.
Use XBox Live. You can purchase points through your video-game console that will be added immediately to your account.
Pay for points with your time. Take surveys to earn a free card at microsoftpoints.net.