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.
The 2003 editions of "Catwings" were available in a boxed set of four, housed in a slipcase, titled "The Catwings Collection" (Orchard/Scholastic). This set was also referred to as the "Catwings Set" by Powell's Books.