For marketing copy, is it correct to say "while supplies last" or "while supply lasts?" I've most often seen "supplies last" but I suppose "supply lasts" could be correct, too, depending on how you interpret supply as a noun – as in "we have a supply of items" versus "we have supplies of items."
Learn English – Which is correct? “While supplies last” or “while supply lasts?”
grammatical-number
Best Answer
'We have a supply of items' is fine and is in the count-mass grey area (?/*We have two supplies of items.)
'While supply lasts' is forcing a more mass usage on this sense, which sounds unnatural.
'While our / the / this year's supply lasts' sounds less outlandish. 'While supplies last' is by far the more usual non-determiner(etc)-accompanied usage.