there's over 100 on Ebay right now they have always been two a penny, if you want a spare i'm sure you could pick up one quite easily for the right price. here's the link.
Jamie.
http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p3902.m570.l1313&_nkw=rolls+razor&_sacat=See-All-Categories