Kits are still available, I doubt Phantom/Vortex would be happy to sell you just a body, but there's no harm in asking.
There arent any crashed ones around at the moment AFAIK, however there may be some part built ones, I know there's a few people working on there's at the moment, Norman would know more details about this as he keeps track of everyones kit and what stage they're at.
The man you need to talk to though is Chris Greville Smith, you can contact him on 01926 857200.
The lead time on a chassis would vary depending if you want a honda or ford engine.
I know Phantom have a part built chassis, which you may be able to come to a deal with them on, and then complete it yourself, there's very little to do to it, mainly welding some bits back on as it had quite a few bits chopped off for an experimental electric car.