The hospital won't at least let you use one while you're there?? The hospital I delivered at let me use one until mine was delivered. They don't necessarily have to deliver it to your home address. They can mail it to where you are.
Oh did you join those groups? I'm sorry I really wish that I could help you. If you post your situation then maybe someone could give you better advice on what to do. Have you asked anyone at the hospital that you're at? Is there a WIC office somewhere near you? I know a lot of hospitals and WIC helps with breast pumps.
Do you have Facebook? You should join a mommy group in that area and see if anyone could help you. Might be easier for people there to hear your message. I am in groups in my town and someone gave me a perfectly new mattress and I am going to pick up some maternity clothes from someone. For free.