Can anyone tell me how many scenarios included in the Battles of Westeros expansions require two core sets to play? I know one of the three bonus downloadable scenarios require a second set, and the Brotherhood Without Banners instructions imply that it too may require more than one set.

I don't know about Brotherhood Without Banners, but apart from that, none of the regular scenarios do. So far, the downloadable "PB2 - Biting the Hand" is the only one to require two base sets.

That's good to know. Shelling out $59.99 for a couple more scenarios seems a little silly.

I'm also curious to know if this is the only way to get another game board. I'd like to have another board to increase the size of the battle field, but if buying another core set is the only way to get one that also seems a little silly!

The new Baratheon set will have a second board to use with the game so I would wait til that comes out.