The cable mod site lets you pick and choose the wires you want so you don't have to buy the whole set. Saves a little cash but still gets the effect. These are nice because you can specify lengths if needed.
Here is a link to their config tool.
For braiding them yourself. I used to do mine all the time, its really easy but does take a good amount of time. As PSU makers starting doing it and/or using all black wires it became less important to me. You will need a kit
like this to do it. Make sure the little lip on the plug comes back out after you extract it or the cable will slide back out. A small screw driver can pry it out.
One tip I'll throw out there is if you are doing single wire braid do one wire at a time then...