I just rang Dyson and bought a new one. It was $100 or so, inc free shipping. I bought a new rollerbrush thingy too at the same time.
Once both fitted it was like having a brand new vac again.
I really wanted a V8 Animal too, but this was way cheaper... Just got official route.
Our officially bought one actually died about 2 months after I bought it (orange light flashing, wouldn't charge) and they shipped me a replacement no questions asked.