Up until a couple of months ago, Fireworks could still be purchased through this link:
That is no longer the case. I checked today: Fireworks is no longer listed.
I think this means Fireworks is now officially no longer sold by Adobe. Development and support was halted back in May 2013, and the Mac version is not really compatible anymore with the latest El Capitan (requiring work-arounds to make it work, and even then issues persist).
It seems Fireworks is now officially dead. Long live Fireworks. It was good knowing you.