You can buy them online from the Marketplace itself on your console or here on Xbox.com by using your credit card, but if you don't have a credit card, no worries. You can also pick up gift cards at hundreds of participating retail locations and use the number on that card to buy your Points.

Ya I feel bad for all the ps3 owners. It's such a rip off that we get it first. I mean, I'm not complaining, but I think they should release it for both consoles at the same time. There's definitely some inter office buttsex going on between Microsoft and treyarch lol.