Dark Ages buildings are pretty easy to build or collect. I made one from foamboard and cardboard (shown here) and you can find plans for buildings knocking about on the web. Or you can buy them from several online stores, with lots of options including printed paper downloads, mdf kits, resin kits and even pre-painted versions. There's something to suit every pocket and they can be used in a variety of games, from Saga to Warhammer and probably lots of others in between. I recently added to my collection with a couple of purchases from warbases. I picked up a timber barn and a viking longhouse for the princely sum of seven english pounds.