With the new GREEN movement the best option for a Halloween costume is to make your own from old clothing you have laying around or doing a costume swap with friends. The limits for costumes are endless! Your imagination is the only thing that limits you.
Many of the crafting sites have great ideas for creating your own costume, or you can use your own creativity to create a fun and inexpensive costume that "recycles" something that you would probably otherwise throw out. Make it a fun kids art project!
Crafting A Green World has an article about the National Costume Swap Day. If you're interested in participating on Oct. 9,2010 go here.