[MisfitRoxy]

You can always try Savers/Goodwill...etc.

I have a friend who has short, red hair, and one year we searched for a red dress that was just below knee lenght and a white collared shirt to sew in underneath it (Orphan Annie). We found both on halloween day and I sewed it together for her and she put her hair in rollers to make it tight. It was perfect and under $10.

That same year, I went as Jackie O. I found a pink skirt suit and some cheap pearls at Goodwill and I bought a piece of fabric that closely matched the outfit and made a little "pill box" hat out of cardboard and covered it with fabric (it's really a lot easier than it sounds). Then I got a little bobbed wig and it all cost me less than $20.

Basically, just think of a few ideas that you might want to be and hunt!
I used to live in MN and I know that the Savers in Columbia Heights on Central Avenue has TONS of really neat stuff for costume ideas.