it sometimes pops up on BG's(Bergdorf Goodman) or NM's(Neiman Marcus) sales section. You also can try calling NMLC (Neiman Marcus Last Call) stores. I don't know if they will send international, however.
A Chloe outlet is opening in New York on 6/1. There is also a possibility that it still carries the Hayley. You might want to try there too when it opens.