I spotted this offer on the Savastore website.
For under £94 you get:
ECS Geforce 6100SM-M MATX AM2 DDR2 VGA LAN Motherboard,
Athlon 64 X2 4000 Dual Core Processor ,
and 1GB of pc5300 ddr2 memory.
Hope that this is a good deal for people looking for a cheap upgrade.