My rope is knotted at both end and is nothing special or expensive. But I use it daily for stretching. I wrap it around my heels and stretch my hamstrings. I hold it above my head and stretch my arms.
There are all kinds of uses for it. I even searched Youtube for some stretching techniques with a rope, but they are all so goofy that I just laughed.
You can get any length of rope you want at Home Depot or Lowe's. My six-foot one is perfect for me. For less than 10 bucks, you've got your own personal stretcher and your first addition to your own Bag of Tricks.