I have found additional ramps at some of the smaller pet stores and also from the Midwest Company. They are sold in a set of two ramps and two shelves for around $50.00. My Fur kids kept sliping off of the plastic shelves and there was so much waisted space that I ditched the shelves and ramps alltogether and designed my own shelves using pieces of wood that measured 23" x 12" and covered them in Nautical carpet which has the water proof backing. If water spills on the carpet the wood doesn't get wet. The shelves are held in place with four large brass wood screws that come out like pegs through the cage. At one time I had even attached eye hooks to slimmer pieces of wood and to the higher shelves and made detachable ramps. The kids liked jumping from one shelf to another vice using the ramps so I took them out and placed in a two story step house that they uses to sleep in or to climb up to the top shelf into the hammy. The cost of the materals to make the shelves only ran me $25.00 and most places will cut the wood for you. Peace Wendy From Harmony House [Posted in FML issue 5150]