I bought a Turbo Snake. It worked, but not very well. I ended up taking the sink stopper apart to clean it out anyways. It did work pretty well on the shower drain, though.
http://www.buytheturbosnake.com/Default.asp?bhcp=1
I didn't actually order it from the television. I was at CVS with my wife when I saw it on a rack with some other "As Seen On TV" stuff.