I don't tend to condone piracy, but if they can't get their act together enough to arrange a proper distribution channel, then they don't deserve your money.
I think there should be a law making copyright on previously distributed products null and void if the IP holder doesn't ensure there is a method of access.
Basically, if you keep it in your basement, it's fine, but once it's out there, it's out there. You can control distribution to a degree (like getting paid for it), but you can't claim it back entirely and make it unavailable to the world.
So yeah, I'd say get a pirated version if you can't buy it from an official channel (second hand copies on Ebay don't count).
EDIT:
Nevermind, you can find it there...
http://store.steampowered.com/app/2600/
I guess you'll have to either suffer Steam's DRM or if you are more of an anti-DRM activist like me, abstain from using the product at all.
In a way, refusing to be exposed to a product that is not distributed according to your terms can be a form of punishment greater than piracy (with piracy, the product at least gets additional exposure), but it does require a reserve of willpower that most customers can't muster.