Note: I suggest clicking the link a few times until you see the lower price, because it seems to change almost every time you click on the link.
12 months of Xbox Live Gold from CD Keys for $45.49
It's been cheaper in the past, but this looks like the cheapest price atm from a reputable seller.
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Note: the price was increased to $52.79 for a while, but it's back to the original price.
Then back up again to $52.79 before dropping to the original $45.49, and so on in circles.
Note to Mod: please ignore my report, it seems the price changes almost every time you click on the link, so the deal is still available. Thanks.