Sheet Music for stringed instruments

Ukulele Sheet Music Online

• edukecation.com - Arrangements for ukulele ensemble.
  
• Noteflight Marketplace - keyword:ukulele
  
• A list of fingerstyle ukulele publications

Other Sheet Music Online

• Sheet-Music-Free

About Copyright and Public Domain scores

• PD Info - Public Domain Song List
  
• Public Domain Sherpa
  
• International Music Score Library Project - Info about copyright and public domain laws in Canada and other countries.
  
• Mutopia Project - Public Domain scores in Lilypond format.
  

The big stores for scores

• Sheet Music Plus
  
• Musicnotes