EXS 24 Logic Sampler Users Group

From Swedish composer Tobias Marberger - G-Town project:

freeware: [http://tinyurl.com/3a4vos]

Check out those AMG packs:

GB \ufffd 30 - [http://tinyurl.com/yuvu35] - a 38 MB, 3 * 37 samples mandolin with 3 layers: open, damped and tremolo

GB \ufffd 60.0 - [http://tinyurl.com/2789aw] - idem, but probably obsolete

And there's also an Irish bouzouki in the last GarageBand jam pack.