Well, I wont pretend that we went 'economy', but we bought a recycled plastic ark from 'Arkus'. A bit of a palaver to put together the first time, but after our weaners went off, we dismantled it, pressure hosed it all down, and it was easy to put back together for the next year. Feels like a clean way of doing things (when we bring new weaners onto the land each year)... Also bought their chicken coop, similarly easy to clean, less prone to red mite...
We got an ark with a floor - which in retrospect was a good idea ..... not sure why we felt we needed a little door too though!!!!! (Beginners!)