How to change my voice for halloween?

I want to be Shredder for halloween, but since I'm a girl, my voice isn't deep or scary. Is there any sort of portable device I could use to make my voice sound deeper?How to change my voice for halloween?
Portable voice changers exist; most that I have seen run $30 to $40 dollars.



Here are a few sample stores that offer voice changers:



http://www.brickhousesecurity.com/vc168.

http://www.spysupplystore.com/Merchant2/

http://www.4yoursecurity.com/product/KJB



You may wish to try eBay to find one at a discounted price, and also may wish to try a few local electronic stores if you don't want to order anything online.



I hope this helps!

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