I have never seen RED chalkboard. SourceOne carries both waterbase and plastisol - both are black.
Magna Chalkboard
Wilflex ONE STEP NYLON Black - while this is not formulated to be a chalkboard ink - it definitely works. Actually, now that I think about it - perhaps you could take this OSN Base, add red pigment concentrate to it, and viola, have a red chalkboard.