Hi Tomas,The Sun blues box set was issued by Charly Records, a UK label. I understood that Charly went bust quite some time ago after losing a legal battle with MCA over the use of the Chess catalogue. However, CDNow seem to have some Charly CDs, but not the Sun blues set - I don't know whether it ever made it to CD.
CD now have lots of Junior Parker CDs. Go to their site and put 'Junior Parker' in the artist search box.
--Stewie.