Here is a soprano ukulele in the martin shape made by Aaron Keim of Beansprout Banjo Ukes. All the wood on this ukulele has been recycled or salvaged from Colorado sources.
Top: redwood from a train trestle
Back, sides, bridge, fingerboard and headplate: Brazilian rosewood found in a barn in Colorado. It is very old and looks great!
Neck: Walnut from a local cabinet maker's shop
It has a rosewood nut and saddle, florocarbon strings and high quality friction tuners. 15 frets with brass dots for fret markers.
This ukulele is mellow with strong mid range yet very loud. The sustain is better than most sopranos and the intonation is spot on.
Its on ebay, of course.