Supreme,
The nylon strap will probably be near the chain isle. I bought a nylon strap for a pickup truck and cut pieces off it. The strap I bought was 12 feet long X 1” wide, and it’s blue. Ask someone if you still can’t find it.
Cable Clamps are either in a small bin around the store, or you’ll need to go to Wal-Mart. They have them in their electrical section by the extension cords.
If you can’t find the pre-sized 2”X1” grippers, then buy the package with one big gripper and cut the 2” X 1” strips off of it.
If you still can’t find them, check the thread Memento gave you for some other ideas. Although, you should be able to find the grippers in Home Depot, or Lowes if there is one near you.