Here's a product that might be useful for some folks ... maybe.
My mother was a little disappointed when she discovered that the ukulele she ordered from Hawaii was a baritone. She didn't know that baritones were tuned differently from sopranos, concerts and tenors. She did want a large ukulele because it was easier for her to handle. Having a baritone however meant that none of her songbooks could be used since they all were written for standard tuning (GCEA).
I saw a set of Hilo Strings from http://www.ukuleleworld.com which allowed standard tuning on a baritone (Baritone Standard Set). I ordered these and restrung my mother's ukulele.