You can make one of those ball chain floggers for about $20. All the parts are readily available at ace.

I've never actually swung mine at a person with any kind of force. I use mine as a sensation toy, but leaving the beads soaking in a bucket of ice water while I'm paddling her with other implements. Once she's reached that rosy glow stage, I just let the chilled ball chains roll around back there for a while before we begin again.

Sometimes I get called the worst names when I hit her with that cold chain.. oddly enough I think that's why I usually start paddling her again.