My baby gate does'nt keep bunnies in the kitchen, they can squeeze through, as does my neighbours rabbit in her house. Had to use the c&c cubes and attach them to the bottom half of the baby gate, tescos is the cheapest I've seen them. Have you thought of putting a wanted add on freecycle?
We used to use a pet gate, however Marmite figured out how to do the the lift and slide action with her teeth! :lol: I have a video of it to post when I'm on computer and not phone.