You want the 4s. Not the 5s. The 5s, mostly, come with the inaccurate three rings on the cover. The 4s all have the accurate 5 rings. It will come with a case. Make sure it has the little rubber tool with the pin included as it's in his case in the movie.
They are very common, at least now they are. Be patient and you can get a complete set for about $50.