I have mailed off 3 of the exact same thing, and after paying for the envelope, the first class, and the dollar extra for adding the tracking number, the total comes out to 5 dollars.
you can buy 6 foot hdmi cables that vary from 5 dollars up to 30 dollars. but the one that I am offering is 10 feet. I haven't seen one at walmart for less than 10 dollars for a ten foot cord. but hey, no one is stopping you from buying one from there. so if that's what you want to do, then do that.