I bought Cowboys tickets last year on stub Hub (thanksgiving day game) and they were about $80 - $90 face value sold to me for $125 each, so it wasn't that bad, but I bought them in September. As soon as I parked the car, there were about 3 different people selling very similar tickets at face value.
With all the overpriced tickets on the internet, maybe it's best you take a chance and buy them at Texas Stadium. If you don't want to do that, I'd say go with Besttix.com

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