Here is where I found all the materials in Austin.
Leather: Found the leather ( a bit thicker than the directions called for) at both Hobby Lobby and Michaels. It costs between $2-$3.
Crystal Chain: I found the biggest selection at Michaels - $3 chain gives you enough to go around the wrist about 3 times.
Hex nut: I found silver hex nuts at Home Depot. You can get a whole back for around $2.
Waxed Linen Cord: I found one color (pink) at Michaels and none at Hobby Lobby...so I improvised. I have found that crochet thread and embroidery thread is available in more colors and much cheaper. The waxed linen is around $4...but the embroidery thread is about 34 cents.
Here is what I made just yesterday!