Get some New Zealand White rabbits. They have litters between 12-14 and are quite prolific, good mothers. They are large rabbits, but don't smell much and seem easy to deal with. You could easily buy very large bags of rabbit pellets and hay at a local feed store for a good price rather than going to a pet store. Feed stores cater to the 4H and FFA groups and usually have goood products that will grow healthy rabbits. They would probably be your best bet. My 6ft boa will be on 4 week old 1.5lb rabbits when he gets here to Texas, with the occassional guinea pig here and there.

Hope that helps!

You can look here: http://www.prma.org/breeder_rabbits.htm for local rabbit breeders in your area and maybe they will sell you a pair of NZW's or will just sell you whole litters of certain sized babies.