In America the 2003 editions were available in a boxed set of four with slipcase title The Catwings Collection (Orchard/Scholastic), listed as Catwings Set by Powell's Books.
In America, the 2003 editions of "Catwings" were packaged together in a four-book set with a slipcase and labeled "The Catwings Collection."  This collection was sold under the name "Catwings Set" at Powell's Books.