I would look around and find something(s) I could sell on eBay or ask to borrow money from friends with an idea of how you could pay it back over time.

Have you anyone you could ask for cat "stuff" of for Christmas? One of the things you could ask for is "money" toward the deposit fee.

Any mothers around where you live that would like some after school care or babysitting so they can go out and shop? Anything you could "trade" your landlord for, secretarial services of some kind?