It's not the best time of year to be buying breeding ewes, as must are going / have gone to the tup. If not . . . you'd have to ask why not? It might be a better idea to look for a bunch of this years ewe lambs, to over winter and breed from next year, you will likely get better stock and it'll be cheaper. It's worth having a look on farmingads and preloved and maybe ask on thefarmingforum and look at the farmers weekly classifieds, and the Baca sheep list (sorry if you're not allowed to mention other forums!). I often see animals for sale at those places.