What make and model of PSU are you using?
I have a 'be quiet' dark power pro 650w. The company said they would send a set 'free' but the postage is $50. Maybe I'm naive but that seems a bit stiff...almost 1/3 the cost of the unit retail. I was hoping to find a cable set here in the USA, for about half of that. I ask the company if they'd send it via Deutsche Post, but it takes a while for them to reply.