Any deals on microsoft points?

Hey all, with Alan wake american nightmare coming, I finally need to buy points. Any place out there selling 1600 or 4000 points for a good price?

I know amazon is like $18.99 but anything like "buy this awesome game get half off points" or like "$40 for a 4000pts card" anywhere?

I'd like to know, too. Looking to get Gotham City Imposters.

Looking for points for Alan Wake too