A search on Amazon for "libertarian science fiction" returns some interesting results. L. Neil Smith and J. Neal Schulman (what is it with Neil/Neals?)m of course, a refrigerator magnet of Heinlein in midshipman uniform, the complete F. Paul Wilson (again with the initial initials!) LaNague Federation stories (staring with "Lipidleggin'")... C.M. Kornbluth and A.E. Van Vogt. (Met Van Vogt, way back when I was a Neo in fandom. At the time, the thought of a Canadian writing books based on the premise that THE RIGHT TO BUY WEAPONS IS THE RIGHT TO BE FREE was not particularly ironic...)
Vin Suprynowicz is there.
Lots of what seems to be self-published stuff, speaking of which, DO NOT buy Carl Bussjaeger's books from Amazon, they're pirated editions.
Anthony Pacheco is there. So is a lot of NOT science fiction...
...A lot of which seems intended to bash libertarianism.
Or Ayn Rand, specifically.
Oddly enough, a "sponsoring link" showed up at the bottom of the page for one of Washington's Representatives, Cathy McMorris Rogers. Less dodly, another one was for The Libertarian Futurist Society.