Argos have all their shredders reduced at the moment. Strip cut shredders start at £5.97 and cross cut at £9.98. Best value in my opinion (and that I purhased) is the Fellowes P50CM Higher Security Cross Cut Shredder at £13.31. It shreds to much smaller pieces than most corss cut shredders - even the most expensive ones - and has a 3 year warranty on the cutters. It appears lots of stock available on all of these.
Pictured is the Fellowes P50CM Higher Security Cross Cut Shredder at £13.31