Just checked on Farnell website (http://uk.farnell.com/jsp/home/homepage.jsp) and they still stock it, although the price has gone up to £6.88. You can order with a credit/debit card although the minimum order is £10 I think (but if you're building a robot you will need two anyway).

http://uk.farnell.com/jsp/endecaSearch/searchPage2.jsp?x=11&Ntt=572-469&Nty=1&N=401&Ntk=gensearch&y=4