cords cost nothing, like 2-3 bucks, if they cost more online, then go to the store.
but you need to solder it onto the flexwatt, if you don't know how to solder, you can your order your flexwatt from helix, they can solder it for you, since they refuse to use those clips, http://www.helixcontrols.com/FlexWatts.htm, those clips they sell with the flexwatt are crap imo also, its not even a proper crimp.
most people tape the flexwatt down with some sort of foil tape, I always use duct tape and don't understand why people use foil tape lol.