The traditional route for an inexpensive Halloween costume is to go to a second-hand shop like Value Village or GoodWill, but have you thought about DOLLARAMA?
I was blown away by the selection they have there right now (see picture I took). If you go now, you have the BEST costume selections and best props to go along with them. You are probably looking at $15 for a really awesome costume with all the make-up, accessories and even loot bag to match!
CHECK IT OUT NOW to not be disappointed with the shelves are cleared.