Hobby Lobby and/or Michaels. HL had more selection. Plus they had more clasps and buckles. Go to ebay for more color choices. My sons started making stuff and now I make stuff too. Addictive for sure. Youtube for ideas and great step-by-step videos.
Menards, Lowes, and flea markets you can find a bundle of leather laces for a couple bucks. Lookin for leather, find a leather shop and buy their scraps cheap.
I get my paracord at Hobby lobby, and always print their coupon from their website (40% off, usually), while they do have a good selection of hardware to go with the paracord, I usually get mine from Lowes, they have a huge selection of split rings, clasps, hooks, anything you could want for a project.