Quick Link: Oxfam

"Oxfam's fair trade coffee"

Cambridge's Oxfam shops have a good selection of high quality fair trade coffee: both instant and filter coffee. Often they have been reduced in price too, so you can actually get a decent jar of coffee for about half the price that your local supermarket sells it.  
 
Moreover, it helps support the farmers - the very people who are exploited by the main coffee brands.