1)Buy some Wrapping paper
2)buy many unstackable/soulbound items
3)Wrap 1 by 1 all the items bought
4) Stack them till 9
5) Wrap the item to dupe
6)Add the 9stack to your wrapped item
7)Unwrap your gifts and enjoy
this works on WoWscape with fixed wrappaper
Edit: do everything in the same bag or it wont work