I know they're pretty cheap these days but I thought this offer from Amazon was pretty good.
http://www.amazon.co.uk/Kingston-Te...00EOMXM0/ref=pd_ts_c_th_1/026-1052123-0730810
http://www.amazon.co.uk/Kingston-Te...00EOMXM0/ref=pd_ts_c_th_1/026-1052123-0730810