Amazon has one called the
MOON LENCE backpacking chair for about $35, depending on color. They have over 500 reviews averaging over 4 stars. Those that compare it to the Helinox say its a bit lighter construction but holds up well and costs far less. It's slightly heavier at 2 lb. The biggest issue in the Q&A was that the legs would sink in soft ground or sand. I think that will apply to any of them with legs instead of a crossbar.