Couple options spring to mind... there are commercial render farms that you can upload your animation to, and they will render it quickly at a price.
Or you could try to set up your own render farm... $8000 could go a long way in building, say 8 barebones rendering machines that you could network together and distribute the rendering via backburner. Is this a one-time deal, or will you be doing a ton of rendering over the next few years?