I just buy these ones. Have been good enough for me if you're trying to keep cost low https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.amazon.com/Bengenta-Stackable-Sneakerheads-Foldable-Organizer/dp/B0B129RT33&ved=2ahUKEwjm-66H49b6AhXXMlkFHWDBAc0QFnoECA4QAQ&usg=AOvVaw1x7tO68gG196C98K41D8ve. Just pay attention to the size you may need.