About six years back, I ordered a bunch (bands and ankle/firewalker tubing) from Balls n' Bands out of South Carolina. I purchased some custom length ones as my arms and torso are both long and I also like that they are high quality + they have low powder options.(Love the Stroops loop, however not sure if they still carry that one although you can get it from the Stroops website.)
I highly recommend for quality bands that won't break, so they last much longer and produce less garbage. My fave brand is Dynaband.