One of my favorite defunct coasters is back on the market - Six Flags Great Adventure's former Batman and Robin: The Chiller.
The ride features two different coasters side-by-side, each launching into separate inversions (Batman an inverted top hat, Robin a cobra roll), followed by heartline twists (later replaced by non-inverting hills), then another boosted launch up a 200 ft. tall hill. Really, a rather unique pair of rides.
Now it looks like whoever owns the ride has listed it through ITAL, with the hopes of a park somewhere getting it out of that field and up and running.
I'm not privy to exactly what the ride's problems were - structural, relating to the trains, or the launches, but perhaps enough time has passed that a park could get it reliably running (or more importantly, affordably running).
Or, perhaps it'll continue to sit in that field. Either way, if you want to learn more of the ride, check out Great Adventure History's super-detailed story on it.