Small Animal Kingdom Hay Rack Petco (store only, not online) - $8.99 RattyRat's Review: We foolishly tried to keep the mess of our rats' hay contained in one area by using this hay rack. It didn't work. Hay still ended up all over the place. So it is not worth wasting your money on. We now just throw the hay in a clump on the floor of their cage and let them grab from that to build their nests. It's just easier that way.