You light up my life
Sure, Mattel is currently releasing one in their TDKR Movie Masters line-up as a BAF or Collect-and-Connect piece, but it'll run you a lot of money and frustration to get it if you can even find all the figures in the series in order to complete it (my guess: you can't.)
Mattel also made a Bat signal as a European exclusive pack-in with some random Batman back pre-DCUC and as much as Mattel LOVES reusing parts ad nauseum, they have never seen fit to release that Bat Signal on US toy collectors. Because: Mattel.
And now that I have one I fully expect Mattel to release about fifty different Bat Signals over the course of the next year because that's how these things go, right?
But who cares, it's a working Bat Signal and I shouldn't have had to wait so goddamned long to find one in a store!