It initially appeared on his own album "Movin' Day" in 1975. This has definitley never had an official CD release.
However, it showed up on a compilation LP "Bag Of Goodies" in 1991, on the San Francisco based Luv'N'Haight label. There appears to have been a CD release of this compilation in 1995. Not currently available, but popular enough in soul circles for a copy to show up second hand every so often. Keep an eye on EBay.