New Delhi, 24 December (NNS): The prices of big cardamom Kainchicut remained firm at Rs 1670 per kg owing to sluggish offtake even after the downfall in the prices. Recently, the prices have gone down by Rs 10 per kg. The average auction price reported to be at Rs 1475/1800 per kg in the last auction which held on 18th December. There is no fear of downfall in the prices during the coming days.