2-Drawer : You'll get this for £29 I reckon, just put a bid in : http://www.ebay.co.uk/itm/BISLEY-fILING-CABINET-/132210274592?hash=item1ec858b120:g:5lkAAOSwfpVZLcKC
4-Drawer : Trade Seller so £90, but you'll be able to haggle if you collect and pay cash no doubt ...