Out - the one at the top of the page is a pretty similar to this common paracord lanyard pattern:http://stormdraneslanyard.blogspot.com/
Here is what I did. First I started out with a Chinese button knott, there the link leaves a loop on the far end of the knot, I didn't. I then ran both ends to the far side, leaving both loops and back to the starting knot. From there, I left a little space from the button knot and used the cobra stitch working back toward the double loops.
Then I was close enough to the ends of the loops that I could still get it to slip over the button knot, I stopped and finished by working the ends back into the braid.
This is actually kind of reverse of if you would use a button. Normally the button would be attached to the two loops and where the button knot is tied would just be a loop to go over the button.
I bought my paracord off of eBay. I found a 1,200 foot spool for $58, making it about .03/foot.