Something that's slipped through the net here: the vinyl release of Black Sabbath's early demos from 1969, when they were still called Earth. The vinyl, The Coming Of The Heavy Lords, is a split LP of Earth and The Flying Hat Band, and is released by Acid Nightmare records. It's the first time this has been available on vinyl (with some speculating this could be a bootleg). The Earth side features four tracks, one a cover of "Blue Suede Shoes", and the Flying Hat Band (Glenn Tipton's band before Judas Priest) side features a demo from 1973.
There's very little in the way of official information about, but there is more info at the Piccadilly Records site here.