918 was discontinued last year, you better start checking Craigslist if you fancy one.
https://en.wikipedia.org/wiki/Porsche_918
Well, the 918 was hybrid, not a "real" EV. Porsche are working on the real thing though (as part of the wider VW group, at least):
http://www.popsci.com/porsche-mission-e-might-be-concept-but-its-innovative-ev-technology-is-real