According to this article, the average Game of Thrones episode costs about $6 Million to make.
Previously the most expensive one was the awesome "Battle of Blackwater" episode, which was an epic large scale cinematic battle that put feature films to shame.
That episode cost around $8 million, so last night's "The Watchers on the Wall" must be in the neighbourhood of $10 million. Seeing that the first season couldn't afford to shoot any battles, they've made up for it big time.
That's pretty astounding when you factor in that HBO does not generate any revenue from advertising like a network does. Either way the product on screen is pretty spectacular. Last night's did not disappoint. Mammoths! Giants!
Film Dweeb Link http://goo.gl/cD7YJX