Do you read Refinery 29? I do and I saw the above for sale in one of the mailers and I thought, "huh, that's pretty and super simple". Then I looked at the price was like what? $7.00 for a set of 4, pffft I know that it's just fold over lingerie elastic. So I did a little digging to my source and found that I could get 5 yards of this stuff for just $2.50 (not including shipping). From 5 yards I can get at least 20-30 of these bands.
I made my order for these three colors and now I am happily wearing them and giving them out to close friends to save them a pretty penny as well. It is part of my obsession with how things work to know materials also. I see every situation and craft as puzzle that needs to be solved. I even started a sketch book this weekend of pictures of outfits that I like and then drawing out the flat patterns for them. It is a sick curse but that also makes me more knowledgeable all around.