Did you know that an old and tired electric razor works as a stud finder? I bought a wed/dry electric razor at a garage sale a couple years ago and was not able to refurbish it. Now I put it to use as a stud finder. I gently slide it across the wall and the sound produced by the razor on the wall clearly changes when it encounters a stud.
A lot of razors that no longer are effective for shaving will work as stud finders! One thing to note, the razor I use doesn't scratch or harm the wall or paint, but there are a lot of different kinds of razors so you may want to test it an out of sight place first.
Joe
Related: 
Finding Studs in a Wall
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