the one with the string cutter is by Planet waves which is quite expensive. The cheaper one is like 2 bucks? Davis, Ranking, Sweelee, Music theme etc. has it.
what i suggest is getting a cheap strign winder i got mine for 3 bucks??
and get yourself a wirecutter...5 bucks at most at hardware store...
rather than spending 20 plus for an overprice gaget...but serves teh same purpose...