Unconscious that it's on sale to the public (3)
I believe the answer is:
out
I believe this clue is a triple definition!
'unconscious' is the first definition.
(similar in meaning)
'that it's on sale' is the second definition.
(I've seen this before)
'to' is a link.
'the public' is the third definition.
(out can mean released to the public)
(Other definitions for out that I've seen before include "what batsman doesn't want to be" , "SECOND PART OF 16" , "Not indoors" , "jury considering verdict" , "Openly gay" .)