It looks like a new low wattage modular PUS has been released by Be Quiet:
http://www.ebuyer.com/283834-be-quie...ular-psu-bn180
http://www.scan.co.uk/products/430w-...e-power-l8-psu
It is under £50 on Ebuyer. The OEM looks like it could be HEC for the 530W and 630W versions.