I came upon a great deal for MS Intellimouse Explorer v3. In PC World they're asking £49.99
Check this http://www.pcnextday.co.uk/area_featured.a...type=3&tgroup=0 (http://www.pcnextday.co.uk/area_featured.asp?group=KEY&pgroup=&stype=3&tgroup=0)
At that price I bought two!