We have a stair gate for sale in great condition. Dimensions : 29.5-38" W X 29.5" H
selling for 30$

As the gatekeeper of your family's safety, you deserve to enjoy a little peace of mind. That's why the Munchkin Auto-Close Gate features a unique, gravity-fed hinge that closes and secures the latch automatically. Simply release the handle and the gate closes and locks by itself. This all-steel gate features a double-locking mechanism at the top to keep the gate securely closed. The extra-wide 21.5" walkthrough makes getting in and out easy, and the door opens both ways for extra versatility. Two included extensions allow you to expand the gate to fit wider openings.