I have a few. A vintage Martin baritone, a Kamaka baritone, a vintage Kamaka soprano (my G'ma's, she played Luaus in Hawaii) and a Luna concert.
The soprano and concert are tuned GCEA and the baritones are tuned DGBE just like the high strings on a guitar. The Luna is great value for the money, this is the one I have
https://www.amazon.com/Luna-High-Tide-Concert-Ukulele/dp/B002SSUR4G/ref=sr_1_3?ie=UTF8&qid=1526827472&sr=8-3&keywords=luna+high+tide+ukulele
FYI, sopranos are very small with a short neck, go with a concert. If you want a Kamaka expect to spend more than $1k, you can also tour the factory if you're ever in Honolulu, highly recommended!