If you don't find a used one, I bought this one and it works great. Now they are $43 with free shipping. When I bought mine they were only about $35 with free shipping. Highly recommended item.
I recommend getting one with detachable cables so that if one goes bad you can replace it.
DUH, must have been a brain fart ---
http://www.newegg.com/app/ViewProduc...107-602&depa=0