Best bet would probably be eBay mate, although you dont always have the guarantee of it being new.

http://cgi.ebay.co.uk/remote-control-matilda-from-robot-wars_W0QQitemZ190048843930QQihZ009QQcategoryZ65247 QQssPageNameZWDVWQQrdZ1QQcmdZViewItemhttp://cgi.ebay.co.uk/remote-control...temZ1900488439 30QQihZ009QQcategoryZ65247QQssPageNameZWDVWQQrdZ1Q QcmdZViewItem

Thats one I saw after a quick search. Dunno how many new ones are in there, a more precise search would probably yield something