The hair braiders are usually available on Ebay, pretty much clones of the ConAir ones from China. I don't see any currently online, but I'd keep checking. They are usually up there for about $15 or so.
The hair braider is really the tool that makes furling them up (regardless if you use my pvc jig or not) super simple. You get even turns clockwise, and then a powered furl counter clockwise of both strands. And if your ends loosen up a little as its furling, you can hit "1" again and add some more twist in to tighten things up at the butt end.