dealstuner, chord finder, metronome, pitch generator…

vote-for3vote-against

5 bucks to ship.

I've wasted 10 bucks on less.....

vote-for2vote-against

Or try this for slightly less at Amazon if you are Prime Eligable (or want to add $15 worth of extras to your order)

http://www.amazon.com/Qwik-Tune-GP1-Guitar-Professor/dp/B000M23OQ8/ref=sr_1_3?ie=UTF8&qid=1364220504&sr=8-3

vote-for4vote-against

Or just get one of several apps to do much the same thing, but are free.