I've bought fresh turkey sausages from the new Waitrose on Reem (they were good!) but only seem to be in stock sporadically. They generally have fresh chicken sausages. Try Spinneys as well as I think they have the same or very similar meats in stock. I do see frozen turkeys in LuLu's now and then so you could get one of those and make your own, they are always massive turkeys though!