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The Antrabata Reference Master label from Japan was the first to release a "complete" set of studio outtakes called Studio Magik in 1997. The Godfather label copied it in 2013. The Godfather label is from Europe (Italy?) and does a pretty good job.
The best place to locate these is Ebay. There are LOADS of Japanese live CDs for every classic band ever. The studio compilations show up too - the mega box set "Studio Magic" (Antrabta or Godfather) doesn't show up all that often.