I tried to purchase point with xbox.com to no avail:
1. Microsoft: The Bank denied the purchase
2. The bank: Microsoft tried to charge us $0.00 so we denied it
3. Microsoft: We always make a charge like this to verify it's real
4. The bank: We still won't authorize it
5. Microsoft CSR: Try buying on Amazon.com
6. Me: bought on Amazon.com. I CAN HAZ POINTZ.