Our breed society has an in-lamb sale in Jan, so that may happen locally to you too.
But I'd ask around and see if a local farmer will sell you a few.
If it were my acre, I would divide it into 4 paddocks too. You rotate the sheep round, new paddock every week, which significantly reduces many worms, whose cycle is around 3 weeks (ie they hatch in the empty paddock each time in this system, have no sheep to infest, so die).