Tab-U-Learn (for Baritone Ukulele) Site, followed by some of their pdf songs.
Lyle Ritz "Lulu's Back In Town" Dominator's Ukulele Tab
Live Ukulele (These guys gather songs a post them from other sites. Here are a few Baritone specific songs.)
I would appreciate knowing about other tablature for the baritone and will add links here as I become more aware of them.