i've actually made a site about halloween and i put a lot of links to other sites in catigories. u might want to check it out
http://www.freewebs.com/ijyhalloween/home.htm
i'm really in to haunted houses
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EDIT: I got my fog machine for $30, a bleeding Scream mask for $25, and an awesome cd with music (called "Scream", it's from a digital TV channal) for $5. I live in canada though, but maybe try ebay or something.
don't pay too much for the fog machine!