Joe,
Welcome to the forum. At this point, there aren't a whole lot of readily available options. (because that would be all too easy, right?)
That said, such a cord exists, but exactly where, I have no idea.
I did some looking online, and did come across this link, which may be useful in your searches. If you find one that you like, feel free to tell your experiences here.
http://www.iqsdirectory.com/power-cords/
--HDTech
The new slim line 850/850 Samsung TV can be mounted very close to the wall, the challange is finding a power cord with right angle plugs at both ends, has anyone out there find a power cord that has these features and is short enough to conceal it behind the TV.
Joe

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic