One item for sale or many (3)
I believe the answer is:
lot
I believe this clue is a double definition.
'one item for sale' is the first definition.
(I've seen this before)
'many' is the second definition.
(I've seen this before)
'or' acts as a link.
(Other definitions for lot that I've seen before include "In the Bible, his wife was turned into a pillar of salt" , "Destiny - biblical character - Polish national airline" , "Large amount - parcel of land" , "Man with salty wife" , "Where filming may take place" .)