I was in hungary last month (where Rubik is from, for non-geeks) and the hotel shop had 2x2 cubes - not very difficult but I don't see one in your collection.
i dont have a 2x2 yet but its on the list.unopened originals are good to get from 1980 or 1 in the old blue box in 78.79.also the star is good for a few quid.barrel cubes would be nice if you see any .....