This one seems to have passed us by, but recently-released by Ace/BGP is About Time – The Terry Callier Story (1965 – 82).
It looks to be pretty much the essential starting point for the folk/soul great, pulling together the best moments of Callier's career, taking from the Prestige, Cadet and Elektra labels. That includes the collectable You’re Going To Miss Your Candyman (a £400 northern rarity), a first-time CD release for Terry's final single and an unreleased folk/funk track from the Cadet archives.
Oh yes – and Ordinary Joe is there (of course). 16 tracks on a single CD, yours for just under £12.