Prices will vary, including old items from the office (7)

I believe the answer is:

copiers

'items from the office' is the definition.

'prices will vary including old' is the wordplay.
'will vary' indicates an anagram.
'including' indicates putting letters inside.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'prices' with letters rearranged gives 'cpiers'.
'cpiers' going around 'o' is 'COPIERS'.

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app