The best place to buy rubber bands for loom rings is at craft stores. Craft stores like Michaels, Joann, or Hobby Lobby have a wide variety of rubber bands specifically made for making loom rings. You can find different colors and sizes to make your rings look fun and unique. You can also try the craft sections of box stores like Walmart and Target. The selection is likely smaller but they are convenient places to shop. Most of these stores have online shopping available as well.