I bought four buildings from a company called Total Battle Miniatures a while back and have got some paint on them now
This picture is of the "Great Hall" and a small wattle and daub dwelling. I've also got a 2nd dwelling and a "workshop" which is about half-way between the sizes of these two. The Great Hall is definitely the star of the show and will make a great centre-piece for a game.
Even though they are sold as Dark Ages, I don't see any reason why they couldn't be used for Late Roman, Northern Europe setting and possibly the workshop and dwellings all the way through to ~1600AD. As I understand it the Romans in Britain encouraged the move away from round houses to rectangular ones, so I'm happy to sub these in for a game of Gallic types against Imperial Romans as a rebellion or something.
On to the buildings themselves - they are not too expensive and I think they are worth it for the cost. I bought them from Maelstrom Games; unlike most MG stock they are not discounted normally, but I waited for one of their frequent 16% off vouchers and bought them then. So it was Great Hall - £6.75; Workshop - £4.20; Dwellings - £2.10. The resin casting quality is not too bad, but there are some problems with bubbles up around the eves of the thatch and the base of the buildings.
On balance I'd recommend them though. A nice quick way to populate a 10mm table.