Someone with (at last check) more than $17,601 lying around might be interested in picking up an Alfa Romeo Montreal prototype. If the seller is to be believed, it's the second one off the line, with the first still sitting in the museum at Arese. To my knowledge, Alfa is the only car company which regularly let gems like this end up in car lots*, so it's a great opportunity to pick up a nifty bit of auto history.
Plus it's an Alfa, so of course you want it.
* Another well-known example is the hand-built Pinninnfarina prototype which WASN'T selected as what would become the 1955 Spider. As I recall, it was discovered sitting in the far corner of a New Jersey used car lot in the late 60s, and has been in private hands ever since.