We have several 'yuge' supermarkets in Cincinnati. Google "Jungle Jim's", for example. Never seen any goose fat though. I'll look for it when I go there this afternoon.
Shake your parboiled potatoes in flour. It really does deliver the finest roast potatoes on planet earth.
My missus used to do them rolled in semolina, got it off Jamie if I remember rightly, I think it just ruins them.