Think you'll find Amarillo is a proprietary variety that is not available to grow by the public.
I have a Goldings at home, so they are obviously around. It's in a pot and I am not looking at thinning out the rootstock until next year at the earliest though.
No idea about Fuggles and Centennial, however I don't recall seeing them available so they might be in the same boat as Amarillo.
Edit: duplicate sentence removed