I have gotten these for a good price on eBay. Just look for reputable sellers with a lot of good feedback for selling these.
There was a deal I guess Sunday night into Monday on ebay...$34.99
Guy sold 15,000...from reading sold out FAST!
I missed out...I'm watching too for them.
I watch slickdeals or fatwallet
The one I mention was listed on buy.com
XBOX Dashboard has it for 39.99. Login to your xbox to see it.
I bought 4 of these to give to my nephew. It will give him a year supply for $40.Target had the the 3 month cards for $10 on BlackFriday.